Desert Nights (1929)

Blazing sun. Burning sand. And scarcely a drop of water. In the vast trackless wastes of the Kalahari Desert, two diamond thieves and their hostage struggle for survival. The thieves have a fortune in gems, but their hostage the manager of the robbed mine has the knowledge to lead them to safety. John Gilbert, starring in his final silent movie, is in gallant form as the mine manager who outwits his captors: a slick conman and the beautiful woman posing as his daughter. (And when famed screen lover Gilbert meets a beautiful woman, fans know it's more than the desert that's going to get hot!)