Vengeance in Death: In Death, Book 6 by J. D. Robb
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He is an expert with the latest technology . . . a madman with the mind of a genius and the heart of a killer. He quietly stalks his prey. Then he haunts the police with cryptic riddles about the crimes he is about to commit - always solved moments too late to save the victims' lives. Police lieutenant Eve Dallas found the first victim butchered in his own home. The second lost his life in a vacant luxury apartment. The two men had little in common. Both suffered unspeakable torture before their deaths. And both had ties to an ugly secret of ten years past - a secret shared by none other than Eve's new husband, Roarke.