Hunter & McCall make a pact of protectiveness and loyalty toward each other when she is nearly killed by her old partner after she tries to stop him from a killer-for-hire assignment.

Hunter and a friend of the victim, a parole officer, are both on the trail of the killer, only to cause a lot of problems for Hunter along the way.

Hunter and McCall trail a hit man who leaves a napkin with a purple circle on it at the scene of each crime. Hunter believes that the killer is the husband of his former girlfriend, a former magazine model. McCall believes Hunter is focusing on the husband of his ex out of jelousy. And Hunter's ex believes her husband is cheating on her, never suspecting the true nature of her spouse's activities.