This FBI agent has come to expect almost anything—not this…

When Agent Mercedes Ramirez finds an abused young young man on her porch, covered in bloodstream and clutching a teddy bear, she has no idea that this is just the beginning. He tells her a chilling story: an angel wiped out his parents and then brought him right here so Mercedes can keep him safe.

His parents weren’t just murdered. It had been a slaughter—a trend kill like no-one on the Offences Against Children team had seen before. But they’re likely to see it once again. An avenging angel is certainly meting out savage justice, and she’s far from through.

One at a time, more children arrive at Mercedes’s door with the same horror story. Each one a traumatized survivor of an abusive home. Each one chafing at Mercedes’s personal scars from days gone by. And each one acquiring its toll on her life and career.

Now, simply because the investigation draws her deeper in to the dark, Mercedes can be beginning to dread that if this case doesn’t destroy her, her thoughts might.