Detective Clay Bryce is investigating the murder of the wife of a prominent Santa Fe plastic surgeon, Doctor Ronald Quenneville. But during Bryce's investigation, he learns the same gun that was used to kill Quenneville's wife also was used in the murder of Alys Chapman. The beautiful and mercurial Mackenzie Stanton, Alys' former roommate, is convinced it was Quenneville who killed Alys, but the surgeon refuses to admit he had been having an affair with Alys. Mackenzie is convinced that her self-declared gift of ESP will help Bryce identify the surgeon as the killer of the two women. But her unwanted intrusion into his investigation causes her to become a target herself.Bryce and Mackenzie ultimately develop an intimate relationship and collaborate to learn Who Killed Alys in the surprising conclusion.