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