Bernice Rhodenbarr is a retired cat burglar who works at a bookstore. Bad cop Ray Kirschman blackmails her, so she agrees to do a job for Dr. Cynthia Sheldrake in order to get the money. While she is doing the robbery, she accidentally stumbles onto the scene of a murder. Since she is the prime suspect, Bernice is forced into many chase scenes as she plays detective to find out who the real murderer is in order to clear her name. Along the way, she almost gets killed by numerous tough guys while being closely followed by two stupid cops.