Fred MacMurray, Claire Trevor, Raymond Burr, Roy Roberts
Claire Trevor plays a narcotics agent who goes undercover to uncover a Mexican drug ring. Disguised as a chorus girl, she gets acquainted with the gang chief. When she finally has the dope on him, in bursts rival gangster, Fred MacMurray who carts off Trevor and the drugs. Unknown to everyone, MacMurray is another undercover agent. Each thinking the other is a crook MacMurray and Trevor constantly work against each other. Things get even more muddled when they fall in love and decide to run away together. They make a run for the border and in a remarkable climax their true identities and occupations are revealed.
"Fred MacMurray is taciturn and tough as the Federal man who poses as a mobster." New York Times Film Reviews, March 6, 1950