Lasse and Maja are two kids that runs a detective bureau. In this movies beginning the kids find a chest made by the composer Alexander von Broms in the crypt of the church with a cryptic message attached to it. The chest appears to solve the financial problems for the local church that is in urgent need of restoration. But when von Broms relatives appear and claim that the chest is theirs a conflict emerges. A few hours later the chest gets stolen and Lasse and Maja tries to find it. The Adventure begins in the City Valleby with its surreal surroundings. There are puzzles to be solved and mysteries to be revealed and the whole family can join in.

Director: Pontus Klänge, Walter Söderlund, Patrik Forsberg

Writer: Malin Nevander, Martin Widmark

Actors: Amanda Pajus, Lukas Holgersson, Tomas Norström

Production: N/A