Former FBI agent, Ryan Hardy is called out of retirement to track down Joe Carroll after he escapes from prison. Hardy works closely with an FBI team, which includes young, razor-sharp Mike Weston. The investigation also leads Hardy back to Claire Matthews, Carroll's ex-wife and the mother of the criminal's young son, Joey. Hardy soon discovers that Carroll has an ever-growing cult of followers.

Ryan Hardy, Agent Mike Weston and FBI Specialist Debra Parker, who is brought in to lead the investigation into Joe Carroll and his followers, dive deeper into the history of Carroll's psyche. To do so, they enlist the help of Carroll's ex-wife, and Hardy's former love, Claire Matthews. Meanwhile, Emma, Jacob and Paul keep Claire's son Joey at a house in the country as they prepare for their next move

Joe Carroll's true intentions are revealed through a new follower, Charlie. As Ryan learns of Joe's plans, he tries to stall Emma, Jacob and Paul by taunting them in hopes of turning them against each other. Meanwhile, Emma makes a shocking decision.

With Weston still in the hospital, Ryan and Parker attempt to outsmart their new leader Nick as a way to continue their search. In a surprising move, Joe reaches out to Ryan to demand Claire's location and reveals that he will go to great lengths to lure her out of FBI custody. Meanwhile, followers from the past make a shocking return.

After losing Claire to Joe's followers, Ryan and Parker attempt to recover while the FBI tracks down an undercover location that may have dark ties to Joe's following. Meanwhile, Claire adjusts to life at the follower's mansion and has an unexpected reunion, while Emma and Jacob continue to deal with Emma's betrayal.

In the explosive Season One finale, Ryan races to stop Joe Carroll before his endgame reaches a deadly conclusion. Meanwhile, Joe leads Claire to a special location and the ultimate showdown between good and evil takes place.

One year after Ryan Hardy's pursuit of serial killer Joe Carroll, a healthy and healed Ryan is living in New York City. On the surface, it appears Ryan's gotten his life back together. But deep down, his obsession with Joe continues to grow. Then, on the anniversary of Joe's death, a new murderous rampage leaves everyone shocked and determined to discover the truth.

After the latest shocking revelation in the case, Ryan and Max attempt to put the pieces together and stay two-steps ahead of the FBI, despite Weston's constant warnings to stay out of the way. Meanwhile, Emma becomes even closer to Mark and Luke, while Joe and Mandy meet up with a follower in search of assistance.

After a tragic turn of events, Ryan attempts to find the man who originally taught Joe to kill, in hopes of finding new answers. Meanwhile, at the compound, Joe tries to get his bearings, while Emma and Mandy wait for him to reveal his new plan.

As his power over the Korban cult grows, Joe sets a deadly plan in action using new acolytes to carry out his demands. Meanwhile, Ryan and Max devise a plan to contact Joe, in hopes of tracking down his whereabouts, and Weston meets with a face from the past.

After a series of public condemnations of Joe and his followers, Joe targets the son of a man who stands against him. Meanwhile, Ryan is faced with the shocking news of Claire's reappearance and Mandy makes a decision that leads her to a familiar face which could undo all that Joe has been working for.

Mark and Luke turn the tables on both Ryan Hardy and Joe Carroll, forcing the two sworn enemies to come together to save the woman they love.

With Joe Carroll awaiting execution on death row and all signs of his following erased, Ryan Hardy has moved on from the dark events of his past. But his newfound happiness is shattered when a series of brutally staged tableaus threatens to tear open old wounds. Ryan and his team are forced to unravel a twisted web of violence before it destroys them all - leading them to face a terrifying truth: Joe Carroll was just the beginning.

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.

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.

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.

A deadly deal is made, but things don’t go as planned, and Ryan makes a decision for his future.

As suspicions rise alliances are shaken and no one is safe in the harrowing final heart-stopping moments.