A marine and a nun form an unlikely friendship. The marine is shipwrecked on a Pacific island and the nun has been left behind there; they find comfort in one another as the two wait out the war.
Mitchum does his best to make the nun's ordeal less painful, but is torn by his growing love for her. Kerr is equally fond of Mitchum, but refuses to renounce her vows. Their unrealized ardor mellows into mutual respect as they struggle to survive before help arrives. Based on a novel by Charles K. Shaw, Heaven Knows, Mr. Allison