US merchant sailor Alex Walker is stranded in Mexico, penniless and wanted by the police. He meets and joins up with an unlikely couple - ageing but likeable shit Phillip Mills and young sexy, frustated wife Missy. The three develop a curiously inter-dependent relationship. Meanwhile, Police Captain Diaz and Detective Ortega are closing in and the plot circle is closed at Tapachula rail station amidst a stack of mistakes and wrong decisions.
New inmate Clay Treyton, doing time for fisticuffs, is sent to a Montana ranch where prisoners spend time working with horses. Encouraged by the warden, the men ride in prison rodeos, and murderer Ry Weston, an ex-pro horseman, is the team's top performer. Clay and Ry become friends, exchanging lessons about horses and life. But when prison black marketeers start leaning on Ry, the men have more than rodeos to worry about.
When Michael Norell witnesses a murder, he doesn't want to testify but he is forced to by the police. A cop is ordered to bring him to the court, but before they get there they have to deal with several attacks from killers.
