Do NOT watch the 1945 or 1978 versions; the 1946 movie is the definitive telling of Raymond Chandler's crazy-quilt book. I read it, years ago, and it was a lot racier than the move...except for one scene...in a bar...between Bogie and Bacall...as they discuss horse-racing.
Bogart at his peak. Bacall at her most sexy. Doesn't make a hell of a lot of sense, but it works and that's what counts.