Steve Abbott and Bill Richards are both lieutenants in the New Orleans police department, colleagues and rivals alike. Steve, seeking love letters his wife Ethel once wrote to a Phillip Wallace, finds the man's dead body and immediately becomes Bill's prime suspect. Both report to Dan Odell, their chief.
Ethel, an amateur detective, investigates on her own while her husband's under suspicion. The trail leads to the Mississippi Inn on the riverfront, where house man Shadrach Jones proves helpful to her. Steve's suspicions turn toward the dead man's brothers, George and Edward, particularly to the former, who runs the casino, helped by girlfriend Janet Price. His boss, Odell, meanwhile, sternly advises Ethel to stay away from the case.
After the slain body of George is discovered, a costumed Edward tries to escape during the Mardi Gras parade as the detectives deduce him to be the killer of his brothers. Steve and Bill join forces for his capture, with an assist from Ethel.
T.S. of The New York Times said, "After changing its name three times, Night in New Orleans descended upon the Rialto yesterday. An appropriate title it is, too, because the picture is about as lucid as a blackout. As a story of murder and municipal skulduggery in Huey Long's one-time parish, it is a thriller so haphazardly contrived, so studded with loose clues and endless coincidence, that even the author seems to have been confused by his meandering fable. Around Preston Foster and Patricia Morison, as a police lieutenant and harebrained spouse who bear a wee resemblance to Mr. and Mrs. North, the producers have rigged an unsteady story of sweet-faced old crooks, blond honky-tonk floozies, thick-headed and toughspoken cops, and the inevitable colored servant who makes sounds of appropriate comic alarm when the lights go out or a body suddenly splashes off a fogbound wharf."[3]
