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Twenty years ago a killer with a unique and horrific signature terrorized the city. As it became clear the killer's cooling off periods between murders halved each time, the police desperately tried to catch him before he might take another innocent life. After eight murders he stopped. Because he died, or was incarcerated for another offense, or moved away, or ...? Serial killers do not stop of their own volition. Correct? Michael Quinlan has an identical twin called Jim. As they were seperated soon after birth, and adopted by different families, they don't share the same name.