Books To Read After Watching Secret Life Of Walter Mitty (philosophical and non-fiction)

Well I watched This movie called secret life of walter Mitty directed by Ben Stiller. And now I want to understand the concept of this movie more in detail. For this I want to find some good philosophical or non fiction books that explores the topics that are addressed in this movie. So if any of you here are interested in philosophy and in the same time watch movies and read books, then please help me out. ✌🏿