When 13 year old Binny and her family move into an old mansion, she finds out she shares her room with the ghost of a 14 year old boy named Melchior, which she can see due to a watch. There’s only one way to get rid of the unwanted roomie: She has to help him right wrongs until he’s liberated from limbo. Their little time-share arrangement thus becomes a crack crime-solving team that solves every case and they have a lot more fun doing than they’d ever let on. At the same time they try to find out more about Melchiors mysterious past and discover a big secret…