Oh no! It's Friday the Thirteenth! The superstitious little mouse Picandou knows exactly that this date brings bad luck. In the cozy burrow of the muscle mice in the basement under Mrs. Fröhlich's delicatessen, everything that can go wrong does go wrong. Hamster Bertram bumps his head and thinks he is someone else. And Pomme de Terre, who wants to help the poor hamster, disappears without a trace. Can Gruyère and Picandou stop the series of mishaps and save their friends? However, they will need an extra dose of luck! Ute Krause's Spiegel bestseller series is wonderfully heartwarming and filled with numerous lavish illustrations; it is suitable for reading aloud to children from 5 years old and for independent reading from 8 years old. The brave muscle mice represent friendship, compassion, and helpfulness - big themes for little heroes! Features: With colorful illustrations.