Crews and Reese investigate a gas explosion in which an IRS agent leading a double life is the victim. Was it an accident or arson? Was the IRS agent trying to be a hero? Crews is once again a suspect in a murder investigation when the detective who handled his case is found dead.

Crews and Reese race against the clock to find the killer when a student acting as a corrections officer in a university's prison experiment ends up dead; Crews obsesses over a recording he got from a wiretap he placed on Reese.

Jane Seever (Gabrielle Union) is assigned as Crews' new partner while Reese is away. Seever and Crews investigate when a court reporter is clubbed to death.