24-four-year-old Caroline Nosel befriends new colleague Christopher O'Kroley, but he soon begins harassing her. After he is dismissed from work, he sets on to seek revenge leading to a tragic outcome.

One June morning in 2013 in Dundalk, MD, cleaning lady Myra goes to the property office and sees a nightmare scene. The office has been ransacked and manager Melinda Schaefer is dead.

Kerri Harris and a colleague find a hidden camera in the ladies' room, and they make a complaint. However, as police begin their investigation to find out who put the camera there, Kerri is found stabbed to death.

When Alisha Bromfield's supervisor, Brian Cooper, promotes her to team leader she should be ecstatic. But Brian's motives are not entirely good. Alisha stands her ground with Brian, letting him know she doesn't want a relationship beyond co-workers.

When Andrea Farrington meets fellow employee Alex Kozak, she feels that romance could be on the horizon, then Farrington's hopeful feelings are replaced by suspicion and fear, leading to a final rejection that has fatal consequences.

Bob Peterson invites himself over to his co-workers Gene and Jaye-Jaye Thurnau's new home to give them a housewarming present; later, Jaye-Jaye leaves the guys alone to run an errand, during which time they vanish.

Theresa Wesolowski, 22, is murdered on May 29, 1999; police are baffled for nearly 10 years before finally getting a break when a new DNA technique identifies her killer.

Sandra Berfield suffers years of harassment from a co-worker and has him jailed for violating a restraining order. Later, Sandra is killed instantly after picking up a package left on her front porch, which held a pipe bomb.

Gayle Isleib is brutally shot to death on April 30, 1996. Police investigate and identify her killer; they find love poems as well as evidence that the killer planned to kidnap Isleib and murder her husband.

In 1995, Robert Henry, an exec in Tacoma, WA, was murdered by a masked gunman. His wife tells police she thought he was killed by a former business associate. Det. Yerbury investigated and pieced together the evidence that convicted the killer.

Leesa Nascimento was murdered on July 6, 2010 by being shot in the head. The killer is traced after evidence is found that ties them to the murder.

Alice Hufnagle is raped and murdered on Nov. 22, 2002; after following numerous leads and dead ends, police find the vital clues that lead them to the killer.