Joe Carroll is on death row and his followers are no more, but a fresh series of brutal killings reopens old wounds for Ryan Hardy and a terrifying new nemesis awaits him and the team.
Ryan may have been able to connect Andrew to Mark, but he and the FBI are unsure of how things may tie into Joe Carroll. Meanwhile, tension mounts among Mark, Kyle and Daisy, and Ryan is placed in a serious situation.
Ryan, Weston and Max hunt down the person responsible for the latest atrocity, leading Ryan to take a deadly risk. Meanwhile, Mark questions Kyle and Daisy's loyalty.
As Mark, Kyle and Daisy plan to make a personal attack on Ryan, the FBI receives a tip leading them to a secret location, which gives them a leg up in the case.
On the day of an important trial, things go awry, causing the FBI to split up to hunt down a missing person. With his team breaking apart, Ryan enlists the help of a former enemy to defeat a greater one.
With their latest target on the run, Ryan and Mike follow a tip to a small town to investigate and confirm he isn't seeking protection. While in town, they both discover an even larger threat who has managed to avoid suspicion up until now. Meanwhile, Max struggles to make a confession.
With only a few days before Joe Carroll’s execution, Ryan and Mike shift their focus to a new threat. Meanwhile, after being approved to start work again, Max rejoins the task force and comes dangerously close to a deadly menace.
The FBI closes in on a suspect whom they believe to be the culprit behind the latest murders, but Ryan is convinced the killer is still out there, leading him to dig deeper into dangerous territory. Joe undergoes evaluation in the days leading up to his execution and a new threat tries to cover his tracks.
After the latest shocking discovery, Ryan finds himself being tracked by the new elusive killer and a game of cat-and-mouse begins leading them both back to Joe Carroll, for different reasons. Max and Mike look for a stolen clue and Mark makes a shocking decision.
With Joe Carroll’s execution day upon them, the team remains on edge, expecting that he won’t go easily. Ryan’s presence is demanded at the scene when a hostage situation ensues, as the world stands by watching the heavy news coverage of the day’s events.
The investigation leads the team to a dangerous serial killer linked to Theo, while Theo and Penny seek refuge from an unknown source with the means of helping them disappear. Meanwhile, Ryan struggles with recent events, sending him into a downward spiral, and the search continues into which agent has been accessing Daisy’s laptop from inside the FBI.
An increasingly reckless Ryan continues his search for Theo, as Mark and Daisy discover information that leads them closer to the FBI than ever and puts Mike in a dangerous situation.
A deadly deal is made, but things don’t go as planned, and Ryan makes a decision for his future.
The FBI hunt for Theo continues and the stakes are higher than ever as some of their own come under attack.
As suspicions rise alliances are shaken and no one is safe in the harrowing final heart-stopping moments.