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It's a vicious game of cat and mouse: relentless FBI Agent Frank LaCrosse steps outside his job to find the brilliant but nameless serial killer who has kidnapped his son. From a death-filled motel room in Amarillo, Texas, to a snow-chocked train pass through the Rockies, LaCrosse follows the tracks of a former railroad man and a mysterious young hitchhiker, one of whom may hold the secret of his search.