Butler's Wager by Robert J. Randisi

Ty Butler came from Eastern wealth—but killers destroyed everyone who shared his name. Seeking a safe haven in the open West, he's found a home among the outlaws, tinhorns, and fugitives who gather at the gaming table. His skill at reading faces and cards has kept Butler in the money—and it's kept him sharp and ready . . . for the assassins who're hunting him down.

Working his way to Dodge City, Butler finds the town in an uproar. A new law's in charge here where Bat Masterson carved his legend—old, powerful, and dangerous grudges are about to explode—and Ty Butler's caught right in the middle. When the gunsmoke clears, he'll have friends and enemies in all the wrong places. And to make it out of Dodge alive, he'll need all the aces he can get his hands on.