Despite appearances a healed Ryan Hardy has gotten his life together, he continues to obsess about Joe Carroll; a murderous rampage on the anniversary of Joe's death leaves everyone determined to uncover the truth.
Ryan receives mysterious phone calls that lead to an encounter with a major threat; revelations about Joe's new life come to light.
The FBI becomes more aware of Ryan's undercover agenda as he searches for a link between the tragedies in New York and the remaining members of the Havenport cult; a shocking event leads to Joe starting a new plan.
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.
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.
Ryan and Max turn to the FBI for back-up on their plan; Joe's relationship enters uncharted territory; Luke ends up in a troubling situation.
Ryan and the FBI's search for Lily Gray is redirected when Max is faced with a new threat; Joe, Mandy and Emma realize everything isn't what it seems at their new hideout.
In hope of finding new answers, Ryan searches for the man who taught Joe to kill; Mandy and Emma wait for Joe to reveal his plan.
New information leads Max, Ryan and Weston closer to uncovering the mole within the FBI; Joe and Micah launch a plan that sends a message to Ryan and the world.
Joe's power over the Korban cult grows, new followers carry out his demands; Max and Ryan try to contact Joe and identify his whereabouts.
Ryan and Mike suspect a new cult leader may be on the rise after another deadly massacre; Joe confirms his new plans for the Korban cult.
Joe chooses a new target; Ryan is confronted with news of Claire's reappearance; Mandy makes a decision that could undo everything Joe's been working for.
Ryan's mission to infiltrate the Korban compound and capture Joe doesn't go as planned; Claire asks Carrie to give Joe a message; Weston makes a life-changing decision.
Many lives are threatened as Joe enacts his final plan; Claire's decision puts her in treacherous territory; Mark and Luke must decide what to do next.
When Mark and Luke turn the tables on Joe and Ryan, the two enemies are forced to work together to save the woman they love.