Smoke Jensen was a towering Western hero. Now his two freewheeling, long-lost nephews, Ace and Chance Jensen, are blazing a legendary trail of their own. Riverboat gambling is a blast, until hot-headed Chance finds out just what he won in his final hand against a Missouri River gambler named Haggarty. Chance's "prize" is a beautiful Chinese slave girl named Ling. The twins want to set Ling free and keep their cash, but at Fort Benton, Ling gives them the slip, robbing them blind. When they hunt her down in Rimfire, Montana, she's with Haggarty, lining up their next mark. Ace and Chance want payback. So does hardcase Leo Belmont, who's come all the way from San Francisco with a grudge and a couple of kill-crazy hired guns. Belmont wants revenge, and Ace and Chance are in the way. Soon the boys are fighting alongside Ling and Haggarty. Because it doesn't matter now who's right and who's wrong -- blazing guns and flying lead are laying down the law.