The Widowmaker (The Widowmaker, #1)

One of the major voices in science fiction, Mike Resnick presents the first volume in a bold new trilogy.Jefferson Nighthawk--known and feared by many as the Widowmaker, the consummate bounty hunter--has been frozen for a century in order to defeat a deadly disease. Only now the cost of his care has risen, so the Widowmaker is called out of retirement for one special commission, and a very large chunk of cash. A notorious assassin has been wrecking havoc on the Frontier; who better but the Widowmaker to defeat him?