When police officer Peggy Whitfield receives a series of social media messages instructing her to commit murder, she is plunged into a nightmare. If she doesn't obey the mysterious messenger, she herself could be killed. But if she does as she's told, she'll kill her estranged brother. As the bodies pile up, Peggy will have to look closely at her past relationships and work with her kind-of-honest, kind-of-boyfriend in the FBI. But can they contain CLEAN before no one is safe?