Michael Lewis is a great story teller, and with this book he approaches a most subtle and interesting tale. It is the story of how two men researched how the mind works. They are Tversky and Kahneman.
Before thinking about the book, consider the story. Tversky and Kahneman blazed a trail that has led us to a more clear understanding of how the human mind works. We are not, as economists thought, strictly rational. To the contrary, our minds are far more complex.
How did they get to those discoveries? Well, read the book. You will enjoy it.