A young couple have what seems to be a comfortable life until one day when the husband returns home from work to find his wife brutally murdered in their apartment. Police find no signs of a break-in and the husband assures investigators that his wife was extremely cautious about home security. She wouldn't open the door to someone she didn't know. Witnesses report an unknown man in the area but efforts to locate him are frustrated. The case goes cold until a year later when another woman is similarly attacked and new information causes Detective Angela Masters to re-examine old theories. The pressure is on for her to locate the killer before he can strike again.