Holed up in the labyrinthine trap of narrow cobblestoned streets and dark dead-end alleys in the bustling Casbah quarter of Algiers, the charismatic leader and elegant Parisian gangster, Pépé le…

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…