The Big Sleep (1946)

Private investigator Philip Marlowe (Humphrey Bogart) is hired by General Sternwood to help resolve the gambling debts of his wild young daughter, Carmen (Martha Vickers). Sternwood's older daughter, Vivian (Lauren Bacall), provides assistance when she implies that the situation is more complex, and also involves casino owner (John Ridgely) and a recently disappeared family friend. As people linked to the Sternwoods start being murdered, Marlowe finds himself getting ever deeper into the case.