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A mysterious castle hidden deep in the ocean
What if a fabulous treasure were hidden in the depths of the ocean? That's the starting point for the Sunken Castle , a children's book conceived and illustrated by Rowane Dujeu-Rousseau .
The story follows Louis, a young boy intrigued by a legend told by seals. Somewhere beneath the waves lies a mysterious castle said to hold an extraordinary treasure.
Driven by his curiosity, Louis puts on an old diving suit and sets off on an underwater exploration full of surprises. His journey takes him through forests of seaweed, coral reefs, and landscapes teeming with marine life.
But the adventure will not be without danger. A fearsome Kraken lurks in the depths, while a majestic humpback whale becomes a valuable ally to the young explorer.
An Introduction to Marine Biodiversity for Children
Beyond its fantasy plot, The Sunken Castle helps introduce young children to the richness and diversity of marine ecosystems.
Dolphins, crabs, seals, and whales accompany the hero on his journey. These species can spark children?s curiosity and encourage them to learn more about the ocean?s inhabitants.
Coral reefs and kelp forests also provide ideal settings for exploring underwater environments.
While not intended to be a scientific documentary, this book offers a gateway to learning about the marine world and can serve as a starting point for discussions about the need to preserve the oceans and their biodiversity.
Rowane Dujeu-Rousseau, a young illustrator worth discovering
A 2025 graduate of the Brassart School, Rowane Dujeu-Rousseau sign with The Sunken Castle her first children's album.
Originally conceived as part of his senior thesis project, the book went on to be published by Le Lys Bleu as part of the Le Petit Lys series.
Through this debut work, the author creates a world that blends adventure, imagination, and a fascination with the depths of the ocean.
Aimed primarily at children ages 4 to 7, the book uses illustrated storytelling to take its young readers on a journey that blends curiosity, courage, and friendship.
A book to inspire a love of the ocean
At a time when ocean conservation is a major environmental issue, children's books about the sea help spark the interest of future generations.
The Sunken Castle is part of this process of discovery by inspiring children to observe marine animals, understand their environment, and wonder about the mysteries of the deep.
For families who love the ocean, nature, or fishing, this picture book can also serve as an introduction to the marine world, before continuing the exploration with a trip to the coast, a visit to an aquarium, or a walk to discover coastal wildlife.
The Sunken Castle , by Rowane Dujeu-Rousseau, is published by Le Lys Bleu Publishing , from the Le Petit Lys series. Published on September 30, 2026, this 36-page children's picture book is priced at 22 euros.
