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Black Cat, Volume 3 (Black Cat (Graphic Novels)) (original 2000; edition 2006)
Amazon.com Product Description (ISBN 142150605X, Paperback)Two years ago, Train, a high-level assassin known as Number XIII in Chronos, left the secret society to live by his own rules. Since then, Train has been a sweeper, a bounty hunter, catching criminals and bringing them in alive. But his main mission is to find a former Chronos member who killed his best friend.
(retrieved from Amazon Mon, 30 Sep 2013 13:47:34 -0400)
Train Heartnet changes from an assassin to a bounty hunter; and Karl ask for Train's help in catching a serial killer with strange powers.
(summary from another edition)
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