A young provincial doctor told Peter Wimsey a mysterious story about how he lost his practice due to a mysterious criminal case... Three years ago he refused to sign a certificate of natural death of a rich old woman. A professional criminal was clearly working here - no traces of murder could be found... He told the story and disappeared. Without giving your name or address. However, Detective Wimsey and his friend Parker are more intrigued than ever. The investigation promises to be hot! One perfect murder (natural death - you can't dig it) follows another. Under suspicion is a man with a sophisticated mind, wild imagination and blood-chilling cruelty...