Cordelia uncovers the mysterious circumstances relating to the discovery of Mark's body. As she gets closer to the truth, there is a further twist as the investigation ends in nightmarish fashion.

Cordelia moves into the summer house where Mark Callender was found hanged, and finds herself threatened. Mark's friends also seem determined to deflect her investigation into his suicide. Cordelia then discovers that Ronald stands to benefit from his son's death.

Cordelia Gray inherits the detective agency she works for, after the death of her boss. Her first case comes when she is hired by Ronald Callender, an eminent scientist, to investigate why his son, Cambridge University student Mark Callender, has committed suicide. She soon discovers the case is more dangerous and complex than it at first appeared.