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 tragic subway killings, Ryan’s obsession with the case becomes stronger than ever. Soon, mysterious phone calls bring him face-to-face with what may be his biggest threat yet. Meanwhile, revelations surrounding Joe’s new life are brought to the surface.

Ryan continues his search to find the correlation between the recent tragedies in New York City and Emma and the existing members of the Havenport cult, while the FBI becomes increasingly aware of his undercover agenda. Meanwhile, a shocking event leads Joe to put a new plan in action.

In an attempt to learn new information, Ryan and Max capture a suspect. But complications lead to a game of dangerous cat and mouse. Also, Joe grows accustomed to his surroundings and establishes a plan of his own, while Emma realizes she is in dangerous company.

Looking for back-up and hoping to execute their plan, Ryan and Max contact the FBI. But Weston has other ideas, leading to a standoff between good and evil. Meanwhile, Joe's new relationship escalates into uncharted territory, and Luke finds himself in a troubling situation.

Ryan and the FBI continue their hunt for Lily Gray, and are forced to redirect their search when a new threat enters Max's life. Meanwhile, Joe, Emma and Mandy arrive at their latest hideout, but quickly realize things aren't what they seem.

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.

Ryan, Max and Weston discover information that leads them closer to uncovering the mole within the FBI - which results in complications of its own. Meanwhile, Joe and Micah execute a plan that threatens the Korban cult in order to announce a message to Ryan and the world.

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.

A deadly massacre, thought to be sparked by Joe Carroll, leads Ryan and Mike into very dangerous territory. But as more details are revealed, they realize another leader might be on the rise. Meanwhile, Joe continues to train the Korban cult and confirms his new plans with Emma and those who doubt him.

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.

Ryan tracks down the location of the Korban compound with hopes to infiltrate the cult and capture Joe Carroll, but all doesn't go exactly as planned. Meanwhile, Claire asks Carrie to deliver a message to Joe, and Weston makes a decision that will change the course of his life forever.

Joe Carroll puts his final plan into action, threatening the lives of many, as Ryan and Mike go to great lengths to stop him and prevent more innocent lives being lost. Meanwhile, Claire makes a decision that leads her into dangerous territory, and Mark and Luke attempt to figure out their next move.

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.