Bubbly 24-four-year-old grocery store worker Caroline Nosal befriends her introverted new colleague Christopher O'Kroley, but he soon begins harassing her. When she complains to management about him, he is dismissed from work and things don't turn out as planned.

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

Scientist Kerri Harris and a colleague find a hidden camera in the ladies' room, and she makes a complaint. However, as police begin their investigation, Kerri is found stabbed to death in her office with co-workers just feet away.

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. Her hopeful feelings are soon 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.