Barely helpful plot summary:
"Why did you have to go on?"
"Too many people told me to stop."
The Big Sleep (1946)
Similar films:
The Big Lebowski (1998)
Chinatown (1974)
Double Indemnity (1944)
To Have and Have Not (1944)
Key Largo (1948)
Laura (1944)
The Maltese Falcon (1941)
Associated people:
Lauren Bacall
Humphrey Bogart
Howard Hawks