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.

Maria enlists Bledsoe's help to destroy a demon and free David from jail. Grace adjusts to life after possession, and Abigail grows stronger.

Maria becomes the target of an obsessive stalker after Abigail leads him on. David falls in with a dangerous group from Bledsoe's past.

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.

In order to rescue Grace, Maria must trespass into Purgatory and face a ghost from her own past; and Enos' dark forces draw closer. Meanwhile, David confronts a terrible secret.

Enos's plans of creating a hell on earth are closer to being realized; Maria, David, and Grace discover a bond to defeat Enos.