In the Caribbean, a Danish freighter is stopped by a fake naval patrol boat, the captain killed and a consignment of platinum stolen. Duval travels first to Mexico, the ship's destination, and then to the island of Andros to check a possible boat used by the thieves. The boat's owner, Gonzales, claims it is derelict and unusable but when Duval checks he finds appearances can be deceptive. He spreads some false information of his own in order to set a trap for the pirates.