One year after Joe Carroll's death, Ryan Hardy has moved on with his life. However, events catch up to him when three men wearing Carroll masks stage a bloody subway slaughter. The FBI want Ryan to consult but he claims to have no interest in the new investigation. Meanwhile, some of the surviving Carrolites try to puzzle out who the newcomers are, and Mike tries to deal with the guilt of Debra's death.
Mourning Rituals -- Bad Moon Rising, The Elliots -- Homebound, England Dan and John Ford Coley -- Nights Are Forever Without You, KC & the Sunshine Band
-- That's the Way (I Like It)
Mark and Luke play a game of cat-and-mouse with Ryan, setting a tableau of murder up and going after Lily. Meanwhile, Joe discovers that life in the Arkansas backwoods isn't all that it's cracked up to be.
Mike and Mendez object to Ryan hiding information from them and ban him from the case... and Lily. Meanwhile, Joe must decide what to do after killing Reverend Glenn, and Mark makes contact with Emma.
Joe turns to another of his followers for help... a follower who is close to one of the persons investigating the subway murders. Meanwhile, Ryan and Max get a lead on Giselle, and Emma meets with Lily.
As Joe and Emma settle in at Lily's manor, Ryan and Max capture Giselle and interrogate her for the whereabouts of her "family."
Concerned after Max narrowly escaped death, Ryan calls Mike and asks him to bring in the FBI to capture Lily and her family. However, Mike comes alone and warns that there is a mole in the FBI tipping off Joe and his people. Meanwhile, Joe and Lily have a falling out.
While Mendez accepts that Ryan is right about Joe having survived his "death," Lily sends someone to abduct Max as revenge on Ryan, who she believes is responsible for her son Luke's death. Meanwhile, Joe, Emma, and Mandy join a strange cult.
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.