Here's a summary of the key plot points leading to the resolution:
1. Walter Mitty is an ordinary, mild-mannered man working at a life insurance company. He lives a routine and unimaginative life, frequently escaping into elaborate daydreams to overcome his timidness.
2. Walter's daydreams consist of heroic and adventurous scenarios where he is brave, skilled, and recognized. These fantasies serve as an outlet for his unfulfilled desires and provide a temporary escape from his mundane reality.
3. Walter's life takes an unexpected turn when he becomes involved in locating a missing photographer, Sean O'Connell, who is crucial to retrieving an essential negative for a magazine cover.
4. Walter embarks on a journey that takes him to Greenland and Iceland in search of Sean. Throughout his adventure, he faces real-life challenges and obstacles that force him to confront his fears and step out of his comfort zone.
5. Walter's transformation occurs when he rescues Sean from a treacherous mountain climbing situation. This act of bravery shows that he is capable of overcoming his fears and taking risks.
6. Walter embraces a newfound confidence and self-belief. He quits his job, starts a romantic relationship with his co-worker, Cheryl Melhoff, and embarks on a more exciting and fulfilling phase in his life.
In the end, the plot reaches its resolution as Walter Mitty sheds his timid and ordinary existence and fully embraces his potential for extraordinary experiences and personal growth.