Gary Cooper, Ray Milland and Robert Preston play three orphaned brothers who are raised at Brandon Abbas by their aunt Lady Patricia Brandon. When money troubles hit the household, attention focuses on the Blue Water Sapphire, the last remaining wealth in the Brandon estate. The sapphire disappears and is thought to have been stolen, fleeing the scandal, the brothers follow each other into the Foreign Legion, where at Fort Zinderneuf they encounter sadistic Sgt. Markoff and face a test of their respective courage, honour and loyalty.
