PJ is pressuring Maggie to get out of her date with Ben Stewart as they are driving along the road from the local tip, when they notice a car that has run off the road. As they radio for an ambulance, they discover the real cause of the accident - the driver has a bullet through his head. Ben is immediately interested, convinced the unknown gun seller from last week may have been involved. He is particularly interested in finding a bullet from the gun to see if it matches one that was used to murder a police mate of his two years ago. Unfortunately, the only available bullet is in the driver's head. But when Det. Sgt. Peppy Romano arrives from Homicide, Ben starts to act strangely. Obviously these two have a history, but it is one they are unwilling to share with the curious PJ and Maggie. Peppy almost immediately announces his chief suspect as being the new wife of the brain-dead driver, citing his reason as the large life insurance held by her husband.

When a visiting detective is accused of murdering a petty criminal and drug user, Maggie and PJ find their relationship under great pressure. The dead man was a vital link in the case involving three missing police guns and the discovery of Det. Sgt. Ben Stewart crouching over his body leads to suspicion that he is the murderer. Stewart has made no secret of his feelings for Maggie and he turns to her for help. While Maggie believes in Stewart's innocence, PJ can only go on the evidence.