On an island lost in the vast expanses of the Pacific Ocean, the famous traveler scientist, honorary member of the British Geographical Society, Gustav Barr, disappeared without a trace. The world scientific community is excited: has this venerable husband really suffered the fate of the legendary navigator James Cook, who was eaten by the aborigines? In order to find out the reason for the disappearance of the traveler, and possibly save him, a certain young millionaire is equipping an expedition to a distant island. The famous sea wolf Captain Mud Fred and his friend Jimmy Ear-to-Ear cannot stay away from such an important event.