A university's prison experiment goes horribly wrong when one of the students acting as a corrections officer ends up dead. Crews and Reese are in a race against the clock to find the killer. As they interview both prisoners and guards, the detectives discover the social experiment may have done more damage than good. Meanwhile, determined to figure out Jack Reese's connection to his case, Crews obsesses over a recording he obtained from a wiretap he placed on Reese.