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... 　　译文(2): 斯坦尼斯拉斯 · 奥斯卡 · 塞米纳里奥，又名 SOS，是一位年轻的探险家，刚从非洲回来，拜访老朋友: 佩斯卡拉家族。但父亲一直收到匿名信。很快就会发生一起神秘谋杀案。SOS 开始调查..。