Walter Mitty is a daydreamer who escapes his humdrum life through his wild imagination. Most people who know him think of him as odd, but it's his best way of dealing with the disappointment that his life is nothing extraordinary. However, he is about to learn the difference between dreaming about amazing feats of derring-do and actually living them. Walter's company faces a threat that could put it out of existence and all of his co-workers out of a job. He becomes embroiled in a globe-trotting mission to save it, allowing him to live out the sorts of adventures that he'd always dreamed of. While he learns the thrill of actually living life to the fullest, he also appreciates the calmer moments of life more.
