Walter Mitty, a daydreaming writer with an overprotective mother, likes to imagine that he is a hero who experiences fantastic adventures. His dream becomes reality when he accidentally meets a mysterious woman who hands him a little black book. According to her, it contains the locations of the Dutch crown jewels hidden since World War II. Soon, Mitty finds himself in the middle of a confusing conspiracy, where he has difficulty differentiating between fact and fiction.

During the start of the Pacific campaign in World War II, Lieutenant Janet Davidson is the head of a group of U.S. military nurses who are trapped behind enemy lines in the Philippines. Davidson tries to keep up the spirits of her staff, which includes Lieutenants Joan O'Doul and Olivia D'Arcy. They all seek to maintain a sense of normal life, including dating, while under constant danger as they tend to wounded soldiers.