After his youth on an Iowa farm, Wyatt Earp is ready to seek his fortunes by his wits rather than the sweat of his back. In California he meets a Mexican girl, whose philosophy will haunt him for years to come. It is the prophecy of the "adobe moon," which reminds a man: If you do not achieve your dreams, you must settle for what you have.
After taking menial jobs, Wyatt settles down as a constable in Missouri. When his wife and child die, he sinks into depression where the lines of ethics blur. Wanted by the law he bides his time for a second chance, until in a Kansas cattle town he encounters his destiny as a lawman to be remembered.