In a northern Italian city, an old building, with peeling walls and falling shutters, has an eerie presence on the main wall, which few people notice. Yet it is incredibly a restaurant business run by two strange people whose identity no one knows. Irene, a student of the Hotel School, is assigned the internship period right there. Meanwhile, in the countryside of the area, some gruesome killings occur. Inspector Saverio Torrisani will have to solve an unusual investigation that has its roots in a distant mystery.