The Loner goes undercover and faces success—or slaughter—in this hard-charging Western adventure from the USA Today–bestselling author.

A beautiful young woman has an incredible story to tell: about her outlaw father, how he got busted out of jail, and then met a bloody end. Katherine Lupo believes her dad, a career train robber, was sprung by someone who wanted to set up Lupo for another crime—and then killed him when the job was done. A Texas Ranger believes her. And he turns to The Loner, a man with the guile and courage to go undercover and find out who was behind Lupo's escape and murder. Posing as train robber, The Loner finds what he is after: a cold blooded and deadly master criminal. But from the get-go, The Loner is fighting for his life, for the lives of men and women on the right side of the law—and one desperate shot to plant an evil man six feet under in Boot Hill.