Neale and Pedro fly cargo between Chungking and Calcutta. When their buddy Bill is murdered they investigate. Neale meets Bill's fiancée Virginia and becomes suspicious of a deeper plot while also falling for her charms.

Fortune hunter Mary Brooks, posing as a missionary's daughter, strives to beat a couple of pilots, Terry Prescott and "Waffles" Billings, (who have turned pearl divers in order to buy a plane and join the Royal Air Force), out of their pearls, while also beating off the advances of Prince Sali who wants to add her to his harem.

Two men searching for black pearls are marooned on an island when their crew mutinies. There they run into a beautiful girl who had been washed up on the island in her childhood. They must fight angry natives and a typhoon in order to survive.

British army sergeants Ballantine, Cutter and MacChesney serve in India during the 1880s, along with their native water-bearer, Gunga Din. While completing a dangerous telegraph-repair mission, they unearth evidence of the suppressed Thuggee cult. When Gunga Din tells the sergeants about a secret temple made of gold, the fortune-hunting Cutter is captured by the Thuggees, and it's up to his friends to rescue him.