Skip to content
🎄Christmas shipping deadline: 19 Dec. Order now!🎄
🎄Christmas shipping deadline: 19 Dec. Order now!🎄
App Blogs The Book Club Newsletter Schools Support Shipping Wishlist Profile Orders
Fantastic Savings

Up to 80% off RRP

Free delivery

On orders over £35 in the UK

1 Million Customers

Bargain prices since 2004

⭐⭐⭐⭐⭐ Service

0116 210 4294 or email us

Isabelle Marinov Collection (Boy Underground & Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing

Isabelle Marinov Collection (Boy Underground & Boy Overboard) 2 Books Set - Ages 9-14 - Paperback

Save 19% Save 19%
£15.98
£15.98 - £15.98
£15.98
£12.99
£12.99 - £12.99
£12.99
Availability:
in stock, ready to be shipped

Free Delivery Over £35 | Express Available

Red Gift Wrap Silver Gift Wrap
SKU B2D7535 ISBN: 9780192439949

Titles in this Set:

1. Boy Underground
2. Boy Overboard

Description:

Boy Underground
Boy Underground is the powerful adventure story of Hugo, an autistic boy who decides to go all the way into the Paris underground to find a place where he belongs.

For Hugo, the world can be too loud and bright. He likes the quiet. He likes the dark. And he loves maps.

When Hugo learns that there’s a whole other world under Paris, a network of tunnels, quarries and catacombs mapped beneath his feet, he sets off on an adventure.

Navigating secret passages, narrowly escaping robbers and returning to old friends, Hugo discovers more than just buried treasure …

Boy Overboard
Sometimes the greatest treasure lies just outside your comfort zone…A year after their underground adventure, Hugo, Alex and Julie are ready for another – this time underwater.

At a scuba-diving camp in Croatia, the three friends search for a legendary Roman shipwreck and an emperor’s lost crown.

Standing in their way is a ruthless businessman, his terrifying bodyguard and Hugo’s fear of swimming in the unpredictable sea. But sometimes the greatest treasure lies just outside your comfort zone…

Learn More

FREE DELIVERY FOR ORDERS OVER £35

We aim to process and dispatch our orders within 24 hours. The orders go into our warehouse to be picked, packed and consolidated into one parcel where appropriate. Please note orders are only processed Monday-Friday.

We sometimes split orders between multiple parcels. Items from our extended range section are dispatched separately.

If any items are missing from your delivery, please allow 2 working days for the rest of your order to arrive before contacting us at sales@books2door.com

All of our books are 100% brand new, unread and purchased directly from the publishers in bulk allowing us to pass the huge savings on to you!

UK DELIVERIES

Single Books and items under 750g

Standard Delivery: £1.99 (2-4 working days)

Orders Under £35

Standard Delivery: £2.99 (2-4 working days)
Express Delivery: £5.99 (1-2 working days)

Orders between £35 and £100

Standard Delivery: Free (2-4 working days)
Express Delivery: £3.99 (reduced rate, 1-2 working days)

Orders over £100

Express Delivery: Free (1-2 working days)

These delivery times are the maximum delivery periods that a purchase can take to reach our customers. Delivery may be sooner than this. These times are an estimation, not a guarantee.

There are no deliveries on Saturdays, Sundays or Bank Holidays.

by Sweet Cherry Publishing
Collect Book Points from your order!

10% cashback is waiting for you! Click on the green icon reading "Unlock Exclusive Rewards" below to sign up.

Titles in this Set:

1. Boy Underground
2. Boy Overboard

Description:

Boy Underground
Boy Underground is the powerful adventure story of Hugo, an autistic boy who decides to go all the way into the Paris underground to find a place where he belongs.

For Hugo, the world can be too loud and bright. He likes the quiet. He likes the dark. And he loves maps.

When Hugo learns that there’s a whole other world under Paris, a network of tunnels, quarries and catacombs mapped beneath his feet, he sets off on an adventure.

Navigating secret passages, narrowly escaping robbers and returning to old friends, Hugo discovers more than just buried treasure …

Boy Overboard
Sometimes the greatest treasure lies just outside your comfort zone…A year after their underground adventure, Hugo, Alex and Julie are ready for another – this time underwater.

At a scuba-diving camp in Croatia, the three friends search for a legendary Roman shipwreck and an emperor’s lost crown.

Standing in their way is a ruthless businessman, his terrifying bodyguard and Hugo’s fear of swimming in the unpredictable sea. But sometimes the greatest treasure lies just outside your comfort zone…

FREE DELIVERY FOR ORDERS OVER £35

We aim to process and dispatch our orders within 24 hours. The orders go into our warehouse to be picked, packed and consolidated into one parcel where appropriate. Please note orders are only processed Monday-Friday.

We sometimes split orders between multiple parcels. Items from our extended range section are dispatched separately.

If any items are missing from your delivery, please allow 2 working days for the rest of your order to arrive before contacting us at sales@books2door.com

All of our books are 100% brand new, unread and purchased directly from the publishers in bulk allowing us to pass the huge savings on to you!

UK DELIVERIES

Single Books and items under 750g

Standard Delivery: £1.99 (2-4 working days)

Orders Under £35

Standard Delivery: £2.99 (2-4 working days)
Express Delivery: £5.99 (1-2 working days)

Orders between £35 and £100

Standard Delivery: Free (2-4 working days)
Express Delivery: £3.99 (reduced rate, 1-2 working days)

Orders over £100

Express Delivery: Free  (1-2 working days)

These delivery times are the maximum delivery periods that a purchase can take to reach our customers. Delivery may be sooner than this. These times are an estimation, not a guarantee.

There are no deliveries on Saturdays, Sundays or Bank Holidays.

We’ve been featured in...

BBC New Logo
The BookSeller metro
2022 Silver Awards
Mums Awards 2022
Innovation Awards 2022

Get your order now

Ordering from Books2Door couldn't be simpler

Order

We make it easy to find your favourite books

Delivery

We pack your order safely and send it straight to your door

Benefits

With book points, wishlist, refer a friend and more, you'll want to shop again

Support

Any problems? Contact our support team

Big Box Sets At Tiny Prices

Welcome to Books2Door, the one-stop shop for all your children's book needs! We specialise in selling cheap children’s box sets and series at bargain prices.

At Books2Door, we believe that reading is a fundamental skill that every child should have to help improve their vocabulary, grammar, and critical thinking skills.

We understand that buying kids books can be expensive. That's why we offer a wide range of box sets and series at affordable prices, making it easier for parents, teachers, and libraries to access quality books for children.

Our team is made up of book lovers who are dedicated to sourcing and providing the best books for kids. We work closely with publishers and authors to ensure that we offer the best books on the market for your child.

Our story

Don't just take our word for it...

Check out our amazing reviews on Trustpilot, Google Customer Reviews, Reviews.io and more!

Trustpilot

FAQs

Are your books brand new? How are they such good value?

All our books are brand new and delivered to us straight from the publisher. Our special sales editions are bought in bulk at a great discount - which we pass on to you!

Are the books different from what I've seen in the high street?

Special sales editions are made with more affordable materials, allowing the publisher to keep the cost price down, and we can sell it for less than the standard editions

What if I have a problem with my order?

Our support team is available during regular business hours to support you with any questions you may have. Call or 0116 210 4294 or email us.
Fantastic Savings

Up to 80% off RRP

Unlimited Delivery

From £9.95 a year with PLUS+

1 Million Customers

Bargain prices since 2004

⭐⭐⭐⭐⭐ Service

0116 210 4294 or email us

{"id":15345215799683,"title":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback","handle":"isabelle-marinov-collection-boy-underground-boy-overboard-2-books-set-ages-9-14-paperback","description":"\u003cp\u003e\u003cstrong\u003eTitles in this Set:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. Boy Underground\u003cbr\u003e2. Boy Overboard\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBoy Underground\u003cbr\u003e\u003c\/strong\u003eBoy Underground is the powerful adventure story of Hugo, an autistic boy who decides to go all the way into the Paris underground to find a place where he belongs.\u003c\/p\u003e\n\u003cp\u003eFor Hugo, the world can be too loud and bright. He likes the quiet. He likes the dark. And he loves maps.\u003c\/p\u003e\n\u003cp\u003eWhen Hugo learns that there’s a whole other world under Paris, a network of tunnels, quarries and catacombs mapped beneath his feet, he sets off on an adventure.\u003c\/p\u003e\n\u003cp\u003eNavigating secret passages, narrowly escaping robbers and returning to old friends, Hugo discovers more than just buried treasure …\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBoy Overboard\u003cbr\u003e\u003c\/strong\u003eSometimes the greatest treasure lies just outside your comfort zone…A year after their underground adventure, Hugo, Alex and Julie are ready for another – this time underwater.\u003c\/p\u003e\n\u003cp\u003eAt a scuba-diving camp in Croatia, the three friends search for a legendary Roman shipwreck and an emperor’s lost crown.\u003c\/p\u003e\n\u003cp\u003eStanding in their way is a ruthless businessman, his terrifying bodyguard and Hugo’s fear of swimming in the unpredictable sea. But sometimes the greatest treasure lies just outside your comfort zone…\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e","published_at":"2025-08-21T16:26:29+01:00","created_at":"2025-08-21T15:34:55+01:00","vendor":"Sweet Cherry Publishing","type":"9-14","tags":["Age_9-14"],"price":1299,"price_min":1299,"price_max":1299,"available":true,"price_varies":false,"compare_at_price":1598,"compare_at_price_min":1598,"compare_at_price_max":1598,"compare_at_price_varies":false,"variants":[{"id":56285303931267,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"B2D7535","requires_shipping":true,"taxable":false,"featured_image":null,"available":true,"name":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback","public_title":null,"options":["Default Title"],"price":1299,"weight":800,"compare_at_price":1598,"inventory_management":"shopify","barcode":"9780192439949","requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnai_2_0dd87e1f-ac3b-4a7b-b10c-b428ae1418d7.jpg?v=1759332486","\/\/www.books2door.com\/cdn\/shop\/files\/front_5152d750-ba33-4409-86ff-39bbf4ada48e.jpg?v=1759332515","\/\/www.books2door.com\/cdn\/shop\/files\/back_64553af3-46d5-43e1-84ae-9e1a2bb8907a.jpg?v=1759332303","\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnail_5cbfb0a4-c9c2-4240-a93f-3fe7c904f3de.jpg?v=1759332275","\/\/www.books2door.com\/cdn\/shop\/files\/spine_f5917bc7-de1f-4aa9-b58b-db190ab4a4dd.jpg?v=1759332539","\/\/www.books2door.com\/cdn\/shop\/files\/inside_2_62a587a8-91b9-4871-b06a-7b8aeba5e2ce.jpg?v=1759332633","\/\/www.books2door.com\/cdn\/shop\/files\/inside_a993ce87-4538-4a3f-8935-20e38c4eff13.jpg?v=1759332618"],"featured_image":"\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnai_2_0dd87e1f-ac3b-4a7b-b10c-b428ae1418d7.jpg?v=1759332486","options":["Title"],"media":[{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634377032067,"position":1,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnai_2_0dd87e1f-ac3b-4a7b-b10c-b428ae1418d7.jpg?v=1759332486"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnai_2_0dd87e1f-ac3b-4a7b-b10c-b428ae1418d7.jpg?v=1759332486","width":3000},{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634376933763,"position":2,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/front_5152d750-ba33-4409-86ff-39bbf4ada48e.jpg?v=1759332515"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/front_5152d750-ba33-4409-86ff-39bbf4ada48e.jpg?v=1759332515","width":3000},{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634376900995,"position":3,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/back_64553af3-46d5-43e1-84ae-9e1a2bb8907a.jpg?v=1759332303"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/back_64553af3-46d5-43e1-84ae-9e1a2bb8907a.jpg?v=1759332303","width":3000},{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634376769923,"position":4,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnail_5cbfb0a4-c9c2-4240-a93f-3fe7c904f3de.jpg?v=1759332275"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/Thumbnail_5cbfb0a4-c9c2-4240-a93f-3fe7c904f3de.jpg?v=1759332275","width":3000},{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634374967683,"position":5,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/spine_f5917bc7-de1f-4aa9-b58b-db190ab4a4dd.jpg?v=1759332539"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/spine_f5917bc7-de1f-4aa9-b58b-db190ab4a4dd.jpg?v=1759332539","width":3000},{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634375917955,"position":6,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/inside_2_62a587a8-91b9-4871-b06a-7b8aeba5e2ce.jpg?v=1759332633"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/inside_2_62a587a8-91b9-4871-b06a-7b8aeba5e2ce.jpg?v=1759332633","width":3000},{"alt":"Isabelle Marinov Collection (Boy Underground \u0026 Boy Overboard) 2 Books Set - Ages 9-14 - Paperback 9-14 Sweet Cherry Publishing","id":67634376475011,"position":7,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/www.books2door.com\/cdn\/shop\/files\/inside_a993ce87-4538-4a3f-8935-20e38c4eff13.jpg?v=1759332618"},"aspect_ratio":1.0,"height":3000,"media_type":"image","src":"\/\/www.books2door.com\/cdn\/shop\/files\/inside_a993ce87-4538-4a3f-8935-20e38c4eff13.jpg?v=1759332618","width":3000}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003cp\u003e\u003cstrong\u003eTitles in this Set:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. Boy Underground\u003cbr\u003e2. Boy Overboard\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBoy Underground\u003cbr\u003e\u003c\/strong\u003eBoy Underground is the powerful adventure story of Hugo, an autistic boy who decides to go all the way into the Paris underground to find a place where he belongs.\u003c\/p\u003e\n\u003cp\u003eFor Hugo, the world can be too loud and bright. He likes the quiet. He likes the dark. And he loves maps.\u003c\/p\u003e\n\u003cp\u003eWhen Hugo learns that there’s a whole other world under Paris, a network of tunnels, quarries and catacombs mapped beneath his feet, he sets off on an adventure.\u003c\/p\u003e\n\u003cp\u003eNavigating secret passages, narrowly escaping robbers and returning to old friends, Hugo discovers more than just buried treasure …\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBoy Overboard\u003cbr\u003e\u003c\/strong\u003eSometimes the greatest treasure lies just outside your comfort zone…A year after their underground adventure, Hugo, Alex and Julie are ready for another – this time underwater.\u003c\/p\u003e\n\u003cp\u003eAt a scuba-diving camp in Croatia, the three friends search for a legendary Roman shipwreck and an emperor’s lost crown.\u003c\/p\u003e\n\u003cp\u003eStanding in their way is a ruthless businessman, his terrifying bodyguard and Hugo’s fear of swimming in the unpredictable sea. But sometimes the greatest treasure lies just outside your comfort zone…\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e"}