A possessed exorcist is forced into a dangerous alliance with a mysterious priest in order to defeat her own father and his army of demons.

Tensions rise as the Society of Sons target David and Grace, and Maria faces a mad demon that Abigail is helpless against.

A demonic lover makes Abigail an indecent proposal, as Maria and Dusty grow closer. Grace searches for her mother against Bledsoe’s wishes.

Enos pits Maria and David against each other, and Abigail makes a dangerous deal as the ultimate showdown pulls them back to where the nightmare began.