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 (Natalie Zea). Meanwhile, Emma (Valorie Curry), Jacob (Nico Tortorella) and Paul (Adan Canto) keep Claire's son Joey (Kyle Catlett) at a house in the country as they prepare for their next move.