Rope Of Sand [1949]

Two years ago, hunting guide Mike Davis was with a client who trespassed on diamond company land and found a rich lode; Paul Vogel, sadistic commandant of company police, beat Mike nearly to death but failed to learn the location. Now Mike is back in Diamantstad in the South African desert, and manager Martingale has a better idea: he hires delectable adventuress Suzanne to ferret out Mike's secret. But she soon finds she's playing with fire.