Unwilling to believe that his brother really commited suicide in Trinidad, Steve Emery's (Glenn Ford) effort to expose the truth quickly lands him at odds with his widowed sister-in-law, nightclub singer Chris Emery (Rita Hayworth). Exasperated at seeing her seducing the espionage agent he suspects is the killer, Steve must then work to bring down the spy ring if he's to keep Chris from becoming next victim.