The three thieves Kasper, Jesper and Jonathan lives together with their always hungry lion in the little town of Kardemomme town, the home to a fair but kind police officer, and the strict Aunt Sofie.

Slip and Sach take the rap for a robbery they did not commit in order to uncover the real robbers, whom they suspect are led by a convict who gives orders to his gang outside via a short-wave radio stashed somewhere in the prison.