The movie itself tells the story of Walter Mitty, who happens to be a hopeless dreamer. He works in archives, and he seems to spend half of his life in his own thoughts, imagining himself as an adventurer. When his and his co-worker's job is threatened, he takes action and experiences a real-life adventure. While trying to save the day, he travels across the world and discovers more about the world he has ever hoped for. How does his story end? You should find out yourself! What needs to be written, though, is that this is more than your regular adventure movie. It's a beautiful movie journey, which is full of witty dialogues, funny situations, stunning views and universal wisdom.
To sum up "The secret life of Walter Mitty" is the great movie for a rainy day, when everything seems so pointless, and you keep doing the same mistakes. It inspires, amuses and teaches. Below I'll post a trailer, so you could have a taste of what's in store for you.