After retrieving a map from a dead gold prospector, Errol Flynn believes it will lead him to gold in Papua New Guinea, and convinces three men to accompany him on a voyage up the east coast of Australia. They leave Sydney on the yacht ''Sirocco'', which Flynn had stolen from Chinese opium smugglers. During their journey, Flynn and his crew encounter a number of challenges, including the Chinese crew attempting to intercept them, desperate to reclaim the yacht and the opium they have hidden on board.