In the murky shadows of an alley lies a female's severed hand. On the tenement rooftop above is the corpse belonging to that hand, a red-haired woman dressed all in black, the body nearly decapitated. Two strands of silver hair--not human--cling to her body. They are Rizzoli's only clues, but they're enough for her and medical examiner Maura Isles to make a startling discovery: This violent death had a chilling prequel. Nineteen years earlier, a horrifying murder-suicide in a Chinatown restaurant left five people dead. One woman connected to that massacre is still alive: a mysterious martial arts master who knows a secret she dares not tell, a secret that lives and breathes in the shadows of Chinatown. A secret that may not even be human. Now she's the target of someone, or something, deeply and relentlessly evil. Cracking a crime resonating with bone-chilling echoes of an ancient Chinese legend, Rizzoli and Isles must outwit an unseen enemy with centuries of cunning--and a swift, avenging blade.