Themes
Double Indemnity (Murder-for-Profit)
Detective Investigations
Inside Jobs
Bank Robberies
Small-Time Crooks and Big Syndicates
Unsolved Murders
Betrayal by a Lover or Partner
Fall from Grace
Crime of Passion
Revenge Gone Wrong
Downward Spirals
Amnesia and Lost Identity
Post-War Trauma and Disillusionment
Motifs
Fatalism
Existential dread
Moral ambiguity
Corruption
Betrayal
Alienation
Obsession
Identity crisis
Revenge
Cynicism
Paranoia
Greed
Guilt
Redemption (often failed)
Double crosses
Psychological tension
Crime and punishment
Characters
Hardboiled detective
Femme fatale
Anti-hero
Crooked cop
Grifter
Private eye
Double-crosser
Down-on-his-luck man
Innocent on the run
Vengeful widow
Corrupt official
Drifter
Ruthless gangster
World-weary narrator
Doomed protagonists
Common Settings