The Night Before - Lisa Jackson

A southern woman is tormented by murders she herself might be committing in this psychological thriller by the #1 New York Times bestselling author.
In the dark shadows of a sultry southern town, a serial killer strikes. It's an act of sinister precision that has happened many times before—because every victim is an offering to a hunger that can never be sated. When Caitlyn Montgomery Bandeaux wakes up covered in blood, she has no memory of the night before. Only later does she learn that her estranged husband was brutally murdered...like so many others she has known.
Wanted by the police and haunted by horrifying, fragmented memories, Caitlyn turns to Adam Hunt, the town's new psychologist. But even as she and Adam grow closer, Caitlyn wonders how much she can trust him. With the killer still at large, the only think she knows for sure is that those who appear innocent are usually the most evil.