An enemy spell has thrown Freya Beauchamp three centuries back, into Salem in 1692, with no memory of who she is. She takes work as a maid in a Puritan household and begins, slowly, to notice what she can do. A newcomer named Nathaniel Brooks pays her attention. So does the Putnam family, who own most of the town and are looking for a way to own the rest of it, and whose young daughter Annie is among the first to start naming witches.
In present-day North Hampton, Joanna, Ingrid, Freddie and Killian know exactly where Freya has gone and roughly what is about to happen to her there. Getting her back means finding an object that has been missing for a very long time, and going places the family has spent centuries avoiding, including the underworld.
The third and final Beauchamp Family novel runs the two timelines against each other, and closes the trilogy by taking the family back to the trials that put the prohibition on them in the first place. The Salem chapters are the strongest thing in it: the ordinary mechanics of an accusation, and how quickly a town decides.