Michael "Beau" Geste leaves England in disgrace and joins the infamous French Foreign Legion. He is reunited with his two brothers in North Africa, where they face greater danger from their own sadistic commander than from the rebellious Arabs.
A doctor is wrongly convicted of murder and sent to prison.
Angela maintains a coastal lighthouse in Italy, where she awaits the return of her brothers from the war. She learns they are casualties and takes solace in the arms of an American sailor washed ashore. However, the sailor turns out to be a German spy, and she is torn between her love for him and her realization that he is part of the enemy force that has destroyed her family.