Which film was the last to feature Humphrey Bogart and Lauren Bacall together?

Key Largo is a 1948 American film noir crime drama directed by John Huston and starring Humphrey Bogart, Edward G. Robinson and Lauren Bacall. The supporting cast features Lionel Barrymore and Claire Trevor. The film was adapted by Richard Brooks and Huston from Maxwell Anderson's 1939 play.

Key Largo was the fourth and final film pairing of actors Bogart and Bacall, after "To Have and Have Not" (1944), "The Big Sleep" (1946), and "Dark Passage" (1947). Bogart and Bacall began an off-screen relationship during production of "To Have and Have Not" and married in 1945, after the film's release.

The film "Key Largo" begins a few years after the end of World War II. Frank McCloud (Humphrey Bogart) travels to the Florida Keys to visit the family of one of the men he commanded. The dead soldier's father, James Temple, (Lionel Barrymore) runs a hotel in Key Largo with the help of his now widowed daughter-in-law Nora (Lauren Bacall). He arrives in the heat of summer to find the hotel closed for the season but occupied by a group of shady characters. McCloud and the Temples take an instant liking to each other. The hotel has been rented for a week by none other than mobster Johnny Rocco (Edward G. Robinson) who was deported from the US some 8 years before but has returned to complete a business transaction with his old partners in crime. As a hurricane descends on Key Largo, tempers flare leading McCloud to protect the Temples from the threat that Rocco poses.