Devils and the Dead

The new werewolf compound is haunted, and Babylon, the only Perkins sister with necromancer skills, is just the right witch for the job. Except this ghost is under a curse and breaking it means a one-way ticket to the world of the elves. There is a way Babylon will be able to break the curse and return to Accident, but it involves tying herself to the architect of hell, a demon that Babylon is already falling for.

It seems like a win/win situation, but the youngest witch of the Perkins clan ...