The sleepy little town Valleby is getting ready for the cafe owners Dino Panini's and Sara Bernard's wedding, and our popular young detectives Lasse and Maja stand ready to ensure that nothing will go wrong. But when the wedding couple's respective relatives arrive, they prove to belong to rival mafia families.

It's late summer in the small town of Valleby, but the calm is disrupted by bad news. The police station is under threat to be closed, which neither Lasse, Maja nor the chief of police wants. They must find a way to solve the situation.