Possible plot points: Reagan investigates a series of possession cases linked to a woman named Mrs. Hyde, discovers her connection to a historical sin or pact, must perform a ritual to defeat her. Along the way, Reagan faces her own fears or past. Antagonist Mrs. Hyde is charismatic yet sinister, preying on the vulnerable. The climax could be a showdown, with high stakes. Maybe a surprise twist, like the real identity of Mrs. Hyde or Reagan herself having a connection to her.