A ship, La Circé, has sunk and it might possibly be criminal . The vessel belongs to Storata ,who asks the insurance company for a hundred million Francs .Callaghan is working for them and he investigates on dry land and on the sea. The brilliant detective discovers that Storata has scuttled his ship himself to swindle insurance.
A group of bandits conspire to kidnap a scientist who can help them manufacture diamonds.Unbeknownst to them , the FBI is already on their case.
An aristocrat short of the readies, Gontran, is to marry a wealthy girl of common birth; but he has to get rid of his lover.
