The Lost Book of Undersea Adventure

Author: Unknown Adventurer

Adventure stories (Children's / Teenage)

Published on 4 June 2026 by Quarto Publishing PLC (Frances Lincoln Children's Books) in the United Kingdom as part of 'The Unknown Adventurer' series.

Paperback | 96 pages
234 x 290 x 11 | 492g

WINNER - 'Children's Travel Book of The Year 2026' - Edward Stanford Travel Writing Award'A clarion call to the child explorer [...] a spectacular immersion in the life of the wild.' – The Guardian.   ‘Breathtakingly beautiful... every young adventurer should read this book.' – Kate Winslet  ‘Packed FULL of adventures’ – Bear Grylls  Join the Unknown Adventurer on his latest adventure, this time entering dangerous waters after being washed up on a deserted island.    This was meant to be a journal of my quest to find the sea nomads, but a few days ago something happened that turned my world upside down . . . You are about to read an adventure story so real you’ll be able to taste the salt water on your lips.  After he’s flung from a ferry after seeing something so dangerous he would be killed for his silence, the Unknown Adventurer washes up on a deserted island. Completely alone, he puts his survival skills to the test and begins the journal he promised his younger siblings he would write.   But after a while he notices that it is not all what it seems on the island and something mysterious lies across the lagoon. Something he must investigate . . .  Presented like an artist’s journal, with handwritten sections, smudged notes and stuck-in pages and illustrated in breathtaking detail, this is a thrilling tale of survival, friendship and underwater discovery.   Take a deep breath. You are about to enter dangerous waters.  Also from the Unknown Adventurer: The Lost Book of Adventure and Journey to the Last River.