Patricia Cornwell delivers the 23rd engrossing thriller in her high-stakes Dr. Kay Scarpetta series. Depraved Heart: "Void of social duty and fatally bent on mischief." - Mayes v. People, 806 III. 306 (1883). 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 20 years ago. As Scarpetta watches, she begins to learn frightening secrets about her niece.