Triptych - Karin Slaughter

When Atlanta police detective Michael Ormewood is called out to a murder scene at the notorious Grady Homes, he finds himself faced with one of the the most brutal killings of his career: Aleesha Monroe is found in the stairwell in a pool of her own blood, her body horribly mutilated.

As a one-off killing it's shocking, but when it becomes clear that it's just the latest in a series of similar attacks, the Georgia Bureau of Investigation are called in, and Ormewood is forced into working with Special Agent Will Trent of the Criminal Apprehension Team - a man he instinctively dislikes.

But then, only twenty-four hours later, the violence Ormewood sees around him every day explodes in his own back yard. And it seems the mystery behind Monroe's death is inextricably entangled with a past that refuses to stay buried ...