Mia and her partner Benny, along with Mia's sister, Alicia, will be in charge of solving some puzzling cases that are happening in their city Hamburg. Surrounded by ghosts and mysterious characters this group of friends, accompanied by other young people, follow their clues.

Friends Franzi, Marieave and Kim planned to spend the summer rehearsing for a Peter Pan play, but when strange things start to happen at the theatre they take on the role of investigators.