

97 minutes
3/3/1948
Stanislas Oscar Seminario, aka SOS, is a young explorer, just back from Africa, visiting old friends: the Pescara's. But the father keeps receiving anonymous letters. And soon a mysterious murder is committed. SOS begins to investigate...

Paul Meurisse
as Stanilas Octave Seminario aka 'SOS', détective

Micheline Francey
as Muriel Pescara, the daughter

Gilbert Gil
as Charles Pescara, the son

Pierre Renoir
as Doctor Gérard Pescara, the father

Jean Tissier
as Guillaume

Pierre-Louis
as Paul Wantz

Junie Astor
as Hélène Tassin, nurse

Jean Debucourt
as Doctor Vermeulen

Jean Brochard
as Investigating judge

Mady Berry
as Brigitte Tassin

Pierre Palau
as Doorman

Arthur Devère
as Lock keeper

Marcel Pérès
as Road mender

Sinoël
as Gardener

Georges Bever
as Baptiste, clerk

Madeleine Suffel
as Hotel boss
Michel Seldow
as Illusionist Pablo

Marc Arian
as (uncredited)

Léon Arvel
as (uncredited)

Alfred Baillou
as Man (uncredited)

Rivers Cadet
as (uncredited)

Marcel Charvey
as (uncredited)
Raymond Destac
as (uncredited)

Pierre Duncan
as (uncredited)
Cécile Eddy
as (uncredited)
Henry Gerrar
as Concierge (uncredited)

Claire Gérard
as Concierge (uncredited)
Colette Mareuil
as (uncredited)

Pierre Moncorbier
as (uncredited)

Geneviève Morel
as Pescara cook (uncredited)

Henri Niel
as (uncredited)

Julienne Paroli
as Gossip (uncredited)

Marcelle Rexiane
as Director (uncredited)

Maurice Salabert
as (uncredited)

Germaine Stainval
as Gossip (uncredited)

Jean-Marc Tennberg
as Agent on duty (uncredited)
Georgette Tissier
as Telephone operator (uncredited)