Shortly after the fall of France to the Germans, an American named Johnson hires Harry to take him fishing on his boat. The fishing trip does not go very well and Harry decides it best to cancel the rest of the trip. Johnson promises to pay his bill after the banks open the next morning.
Back in Fort de France, Frenchy the bartender, asks Harry to rent him his boat for one night to transport some members of the resistance, but Harry refuses to become involved. Later, in the hotel bar, Harry sees Marie pick Johnson's pocket, and when she leaves the bar, he follows her back up to her room. After which they begin stormy relationship.
Later they are forced to take a job for the resistance transporting a fugitive on the run from the Nazis to Martinique.
The chemistry between Bogart and Bacall is some of the most natural acting I have ever seen on film.
The Horn Blows at Midnight, gave her a leading role with Jack Benny and Alexis Smith. Unfortunately, She suffered ill health which reduced her ability to work. Her film career ended in 1954 with a featured role in the John Payne and Lizabeth Scott western film, Silver Lode.