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Merciless: A Novel of Suspense (edition 2008)
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Wikipedia in English
Amazon.com Product Description (ISBN 0099499827, Paperback)When the first body is found, mutilated and strangled on the riverbanks, Philadelphia homicide detectives Kevin Byrne and Jessica Balzano suspect yet another case of random urban violence. Then it happens again. And again. Carefully dressed and posed, each victim seems to tell a story so gruesome that Byrne and Balzano struggle at first to make sense of the killer's dark and twisted imagination. But when they stumble upon a collection of old fairy tales, the fragile link between the murders suddenly becomes clear - and with it the terrifying conclusion of the killer's plan. Desperately, they try to anticipate the madman's next move, but as the body count rises, the killing spree spirals out of control ...
(retrieved from Amazon Sun, 06 Jan 2013 16:42:31 -0500)
Darkness has fallen on the streets of Philadelphia. The strangled corpse of a woman in an oddly old-fashioned dress is found on the banks of the Schuylkill River, her feet mutilated and torn, and homicide detectives Kevin Byrne and Jessica Balzano know that this Christmas won't be much of a holiday for them.
(summary from another edition)