After a painful divorce, Blair Mallory follows a dream and opens a health club. But Nicole Goodwin, a troubled member of the club, develops a strange fixation on Blair, imitating her style and dress, even the car she drives. Then Nicole is gunned down in the club's parking lot. And Blair is the only witness to the murder.

At first the police investigation concentrates on Nicole and her acquaintances, but then someone tampers with Blair's car, and sabotages her home and business. The police - including Blair's old flame Lieutenant Wyatt Bloodsworth - are baffled because these attempts, while serious, are very different in tone from Nicole's murder. Is Nicole's killer seeking to remove a troublesome witness? Or was Blair the intended victim after all?