L'ennemi dans l'ombre

Via Something Weird: "Four men representing the world’s great criminal organizations unite to locate a cache of sunken treasure. The treasure is in fact a fortune in diamonds and secret documents that was lost by the Germans in the seas off Monte Carlo during the war. Following their every move are representatives from every secret agency in the world, amongst them, the British, the Russians, the Germans, and the Americans, all seeking the important papers contained within the treasure."

This drama's main asset is Charles Boyer as Pierre, a father out looking for his son one night. Pierre receives a call from a woman who says she will kill herself because of his son. Naturally disturbed at this news, Pierre takes off to find his son and avert disaster. Along the way, he picks up a malcontent, wealthy young woman who decides to stick with him and help him look for his son. After traveling through some of the worst aspects of Paris' demi-monde, Pierre begins to wonder if his son will ever be found. Meanwhile, the relationship with his newfound wealthy friend is heating up.

When an oily attorney dies at the hands of the mafia, a dedicated French detective investigates the man's murder. He soon uncovers a drug-smuggling operation and lets his sawed-off shotgun do the talking to the toughs in this Gallic gangster feature.