Bogart and Bacall’s film partnership began with "To Have and Have Not" in 1944. Bogart was already an established star by this time and the film debuted director Howard Hawks’ newest discovery Lauren Bacall.
Bogart and Bacall’s chemistry both on and off the screen made the film a gigantic success, simultaneously launching Bacall’s career and her screen partnership with Bogart.
Their second pairing was in the 1946 film "The Big Sleep", also directed by Hawks. By the time the film was released Bogart and Bacall had married in real life, portions of the film were re-shot and scenes were added to make the most of the much publicized romance.
Their third film was 1947’s "Dark Passage" directed by Delmer Daves. The film has a different tone to Bogart and Bacall’s previous work and received mixed reviews on release.
Their last film together was "Key Largo" released in 1948 and was directed by Bogart’s long term friend and collaborator John Huston. The story doesn’t focus on a Bogart-Bacall romance as with their previous films, however the film does not suffer as a result.