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...

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Main Cast: Paul Meurisse, Micheline Francey, Gilbert Gil, Pierre Renoir, Jean Tissier, Pierre-Louis, Junie Astor, Jean Debucourt, Jean Brochard, Mady Berry

Director: Jean Devaivre

Writer: Jean-Paul Le Chanois

Editor:

Cinematographer: René Gaveau

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