Coconut, Oskar, and Matilda receive a message in a bottle from their friend Onion, written by the little green dragon from a shipwreck. He was cooking in the galley when the ship capsized. The sailors managed to save themselves, but Onion and the monkey Jojo are trapped in an air bubble in the wreck. Fortunately, the wreck hasn’t sunk completely but is still resting on a rock ledge. Now Onion and Jojo are hoping for help from their friends! Coconut, Matilda, and Oskar immediately run to Trödel to gather the necessary equipment. Will the rescue mission be successful?

The exciting adventure stories featuring the little dragon Coconut and his friends have become classics in children's literature. Ingo Siegner writes about courage and friendship and enriches the books with original illustrations. The "Dein-Spiegel-Bestseller series" is perfect as a gift for reading aloud and for children aged 6 and up.