Mitchum is a Marine and Kerr a Roman Catholic nun who has yet to take her final vows. The two are trapped on a South Pacific island controlled by Japanese troops. Hiding in a cave by day, they forage for food by night, and Mitchum, though respectful, attempts to get Kerr to tell him her
background. Slowly their lives are revealed to each other while they are constantly endangered by the enemy. Mitchum then conducts a major night raid on the Japanese food supplies and is almost caught. He returns with a storehouse of goods, plus a bottle of sake, and proceeds to get drunk. In his
cups, the Marine blubbers his affection for Kerr but she sidesteps his awkward advances...