In the elevator of two large Parisian buildings, a telegraph operator discovers the body of an elderly woman, Madame Mathieu, the owner of both buildings. Boucheron, the local superintendent, is dispatched to investigate, along with his rival, Inspector Lambert of the "Sûreté". To solve the enigma, they scour staircases and corridors, visiting every floor of both buildings, courtyard and facade. Their gruff rivalry allows them to complement each other in discovering who committed the crime among a gallery of characters, humble or rich, who all have something to be ashamed of... A rare, fast-paced, picturesque comedy set against the backdrop of a police mystery.
Commissioner Boucheron, district police officer
Inspector Lambert of the Sûreté
Alfredo d'Avila, dancer of these ladies
Gaby Valrose, minister's lover
Mrs. Rameau, wife of an industrialist and mistress of Alfredo
Picking, knife-throwing artist
Mr. Corbeau, kleptomaniac
Madeleine Martin, in love with André
André Laurent, bank cashier, lover of Madeleine
Lydia, singer at “Perroquet”, mistress of the President
Eric, German naturalized French
English, Albert's companion, Eric's mistress
Albert Durant, stockbroker and poker player
Concierge of the two buildings
Judge Bernier, President of the Court of Appeal
Owner of the "Perroquet" and the festivities upstairs
Mrs. Bernier, wife of the President
Telegraphist who discovered the corpse
Brigadier
Soldier, confined in the room of a “country”
Marie, Lydia's dresser
Mr. Martin, blind, father of Madeleine
Jules, government minister and Gaby's lover
Taxi driver (uncredited)
Agent (uncredited)
Agent (uncredited)
Agent (uncredited)
Pianist of the “Perroquet” (uncredited)
(uncredited)
Director
Writer