Humphrey Bogart and Lauren Bacall in "The Big Sleep," 1946 Warner Bros.

"The Big Sleep" Humphrey Bogart and Lauren Bacall 1946 Warner Bros.

"The Big Sleep" Lauren Bacall and Humphrey Bogart 1946 Warner Bros.

"The Big Sleep" Humphrey Bogart, Lauren Bacall, and Martha Vickers 1946 Warner Bros.

"The Big Sleep" Humphrey Bogart and Martha Vickers behind the scenes 1946 Warner Bros.

Lauren Bacall on the set of "The Big Sleep" 1946 Warner Bros.

Lauren Bacall and Humphrey Bogart in The Big Sleep (1946)

Humphrey Bogart and Dorothy Malone in The Big Sleep (1946)

Humphrey Bogart and Carole Douglas in The Big Sleep (1946)

Humphrey Bogart and Regis Toomey in The Big Sleep (1946)

Humphrey Bogart, Regis Toomey, and Emmett Vogan in The Big Sleep (1946)

Humphrey Bogart, Joseph Crehan, and Regis Toomey in The Big Sleep (1946)

Humphrey Bogart, Sonia Darrin, and Louis Jean Heydt in The Big Sleep (1946)

Lauren Bacall, Humphrey Bogart, and Bob Steele in The Big Sleep (1946)

Lauren Bacall, Humphrey Bogart, and Martha Vickers in The Big Sleep (1946)

Humphrey Bogart, Trevor Bardette, and Bob Steele in The Big Sleep (1946)

Humphrey Bogart and Martha Vickers in The Big Sleep (1946)

Humphrey Bogart and Trevor Bardette in The Big Sleep (1946)