The first body is a mystery. She's young. She's beautiful. And her corpse, laid out in the office of Boston medical examiner Kat Novak, betrays no secrets - except for a matchbook cluched in one stiff hand, seven numbers scrawled inside. The next body is a warning. When a second victim is discovered, Kat begins to fear that a serial killer is stalking the streets. The police are sceptical. The mayor won't listen. And Kat's chief suspect is one of the town's most prominent citizens. The final body ... might be hers. With the death toll rising, Kat races to expose a deadly predator who is close than she ever dreamt. And every move she makes could be her very last.