A mousy, poor manicurist seeks to switch places with her more glamorous, wealthy twin sister.
A con artist seduces the widow of a millionaire, only to learn she'd plotted with her lover to murder the late husband. A tense game of cat-and-mouse ensues—but who's the cat?
After the mysterious disappearance of an oil well owner, one of his workers, Gerardo assumes the business management. Soon, the owner's sister arrives from Argentina, and, believing that Gerardo killed her brother to keep the wells for himself, she starts working as a singer under a false name in the same casino her brother disappeared, in order to find out what exactly happened.
