Rawhide river

"Britt Cahill stood in the shadow of the gallows. He was trying to find the man who could prove him innocent of murder. All clues pointed West toward Montana. But when boarded the steamboat, Cahill was stepping into a rattler's nest."@en
""When Britt Cahill returned to St. Louis he stood in the shadow of the gallows. But he was desperately seeking the man who could prove him innocent of murder. All clues pointed West toward Montana. But when he boarded the Missouri River packet, Cahill was stepping into a rattler's nest of hardened renegades who had orders not to let him reach the end of the voyage alive!" p. [4] -- cover."
"When Britt Cahill returned to St. Louis, he stood in the shadow of the gallows. Britt was desperately seeking the man who could prove him innocent of murder. All clues pointed west toward Montana. But when he boarded the Missouri River packet, Cahill was stepping into a rattler's nest of hardened renegades who had orders not to let him reach the end of the voyage alive!"