Target audience: Children aged 5 and up. Following the success story "Arthur and Anton," it's time for the two unusual friends to embark on a new adventure. In "Arthur and Anton: The Message in a Bottle," rat boy Anton and raven Arthur, along with their friends, set out to find the mysterious sender of a message in a bottle that washed up in the canal water, instantly sparking the curiosity of the little gang. To track down the enigmatic writer, they ask Leopold, the waiter from the canal bistro, and Willibald, the carp from the Goldbach. The latter has the crucial clue about the letter writer, and quickly the agile group sets off on their journey. The exciting second volume "Arthur and Anton: The Message in a Bottle" has also been written and illustrated by author and illustrator Sibylle Hammer for children aged five and up. The book is available in a bilingual edition.