The FBI closes in on a suspect whom they believe to be the culprit behind the latest murders, but Ryan believes the killer is still out there, leading him to dig deeper into dangerous territory. Meanwhile, Joe undergoes evaluation in the days leading up to his execution and a new threat tries to cover his tracks.

With Joe Carroll's execution day upon them, the team remains on edge, expecting that he won't go easily. Their fears are realized when a hostage situation at the prison forces Ryan to go in alone, as the whole world watches,.