Filmatec

Back from Indochina, Tony and Dick, two French soldiers, are now in possession of more than 20 million, entrusted by a trafficker. They buy a nightclub in the district of Montparnasse but are soon hunted by the thug who wants to recover his money.

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.

After a planned robbery on an armoured car the investigating police officer encounters a female journalist who specialises in criminology, and who he suspects may have had a role in the heist.

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."