Dr. Kay Scarpetta is working a suspicious death scene in Cambridge, Massachusetts when an emergency alert sounds on her phone. A video link lands in her text messages and seems to be from her computer genius niece Lucy. But how can it be? It's clearly a surveillance film of Lucy taken almost twenty years ago. As Scarpetta watches she begins to learn frightening secrets about her niece, whom she has loved and raised like a daughter. That film clip and then others sent soon after raise dangerous legal implications that increasingly isolate Scarpetta and leave her confused, worried, and not knowing where to turn.