Sam Weston is framed for stealing a company payroll. Breaking out of jail, he returns to The Yellow Rose of Texas showboat to clear his name. Weston and his daughter Betty (Dale Evans) enlist Roy Rogers to help prove his innocence. Roy Rogers and Trigger get top billing in this thrilling who-dunnit, which combines all the action best loved in Roy's adventures, with the magic of showboat performance and entertainment. It's also one of the earlier examples of the on-screen chemistry between Roy and Dale, and features a duet on the classic title song. Music includes "Down Mexico Way" (featuring Janet Martin), "Show Boat," "Take It Easy," and "Down In The Old Town Hall."