Assignment: Mexico (1956)

When a woman, the wife of a notorious international gangster, cooperates with the Mexican police, her husband takes steps to eliminate her as a potential witness. The police commissioner, knowing that the crook's flight was booked by a local American travel agent, asks the woman to keep discrete tabs on her client and note whom the man meets. The travel agent realizes that the man she has been tailing is an impostor and the killer is closing in his quarry unbeknownst to the police.