Stanley Livingstone (Lou Costello) is a timid book salesman who has memorized a map from a rare book, which leads to a hidden diamond mine in Africa. Livingstone's friend, Buzz Johnson (Bud Abbott), uses this information to attempt to scam money from explorer Diana Emerson (Hillary Brooke), who is searching for the mine. Emerson decides to take both Livingstone and Johnson up on their offer and the trio begins leading an expedition into the darkest wilds of the African jungle, where adventure and hilarity abound.