Bret Maverick falls for a soft-spoken girl, Modesty Blaine (Mona Freeman). They enter into a partnership — to sell cats to a mining camp overrun by rats. But rumor has it that most men lose either their lives or their money when dealing with this young beauty. However, Bret stands to lose both his life and his money, so he plots to save both.

Inheriting a stagecoach line from Uncle Micah is only the beginning of financial problems for the Maverick brothers.