Pete (Robert Wagner) probes the background of an old flame's fiance, unaware that he is homicidal. The engagement of Pete's college sweetheart to a man he distrusts sends Pete on a frenzied trail to reveal the man's true motives before the impending marriage. Tiffany Boiling and Joseph Mascolo guest star.

Shirley Harris, a blind music teacher, hires Pete and Mac for protection after her presence at a murder is detected by the killer.