Dark Briar: Book Two of the Dark Lady Series

Five years after Kelly escaped the fire consuming Eve and her cult. She starts getting mail from the dead murderer and gets re-traumatized. She has to go to Boston to end it. She knows no one and needs new help to fight powers she can’t understand or believe. Attacked as soon as she gets there, the cult has either expanded, or she’s wrong to hunt Eve. There is nothing to do but go all in if she wants to escape Eve forever.