One of the hundred books a year I read:

When Atlee Pine was five, a man broke into her bedroom and kidnapped her twin sister. Mercy’s body was never found.

Now an FBI agent, Atlee returns to her hometown in Georgia in an attempt to solve the crime. As she reconnects with people who knew her family, she discovers the mystery is much deeper. Her parents may not have been who they claimed to be and their past may be directly connected to her sister’s disappearance.

While in the town, Atlee has another problem. Bodies keep turning up, staged in a way that indicates a very depraved serial killer is on the loose.

Can Atlee catch a serial killer and solve her own family’s mysteries?