Director William Dieterle did better movies than ROPE OF SAND but he never did one in more unusual settings than in South West Africa, now Namibia. Paul Henreid and Peter Lorre had featured in CASABLANCA seven years earlier, Rains had pulled off one of his best performances in Hitchcock's NOTORIOUS three years earlier, and Lancaster was beginning to make a name for himself. A really good cast for a film that did not seem set for great box office returns.
Interesting to note that apartheid was about to appear in that part of the world, yet it is human greed that dominates the film, with diamonds the commodity most sought.
Acting is generally good, although the French accent hinders Calvet's delivery, even renders it awkward at times. The fighting sequences fall somewhat short of credible. The screenplay is also uneven. Photography is very good.
As a little known film, it deserves watching. And it posts enough quality to not rate a waste of time. 8/10.