|Jeanne Moreau||Florence Carala|
|Maurice Ronet||Julien Tavernier|
|Jean Wall||Simon Carala|
Restless femme fatale Florence Carala recruits her lover, Julien Tavernier, to murder her wealthy husband, Simon, in his office and make it appear like a suicide. Tavernier does the dirty deed eagerly, but becomes trapped in an elevator when he returns to remove a key piece of evidence he had accidentally left behind. Tavernier's unfortunate oversight sets into motion a dark ripple of events that bloodies the cold Paris night.