Blink is a study in how the human mind processes and forms conclusion within the blink of an eye. In this book he explores how first impressions are often correct, even if we don't understand why, but also how they can go horribly wrong.
Throughout the book Gladwell gives us several in-depth examples of various experiments conducted by researchers on just this topic. I found some of them quite interesting, particularly the information on the war game conducted by the US government and what he called "mind-reading" which is really nothing more than the ability to read micro facial expressions. However, I felt there were places in the book that just got overly repetitive. Some of the book could have been edited as it felt like at times he just kept hammering at the same point. Overall, it was an interesting topic and I learned quite a bit. I would consider picking up another by Gladwell if the topic intrigued me.