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...
as Stanilas Octave Seminario aka 'SOS', détective
as Muriel Pescara, the daughter
as Charles Pescara, the son
as Doctor Gérard Pescara, the father
as Guillaume
as Paul Wantz
as Hélène Tassin, nurse
as Doctor Vermeulen
as Investigating judge
as Brigitte Tassin
as Doorman
as Lock keeper
as Road mender
as Gardener
as Baptiste, clerk
as Hotel boss
as Illusionist Pablo
as (uncredited)
as (uncredited)
as Man (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as Concierge (uncredited)
as Concierge (uncredited)
as (uncredited)
as (uncredited)
as Pescara cook (uncredited)
as (uncredited)
as Gossip (uncredited)
as Director (uncredited)
as (uncredited)
as Gossip (uncredited)
as Agent on duty (uncredited)
as Telephone operator (uncredited)
