One night, when a small group of people have been drinking, Alaska suddenly urges to drive off campus because she "has to do something".
The next day, when the boy finds out she was killed later the previous night, he feels guilty for not stopping her, but he is also depressed because he never to told her that he loved her. He entered into depression while trying to solve the mystery of her disappearance.
I don't know why I value the book so highly. But it struck me in a way that books normally don't. The message the book sent was that you should not take things for granted. And if you want something, make it happen.
Someone once said, "Life is time, and time is all we have.". This is clearly the message the book wants to give.
He did not solved the mystery of her disappearance. But he accepted the fact that he would never know for sure what had really happened that night. This book is by far one of the best books I've ever read and I recommend it strongly. It was not a typical love story, but it had a much deeper meaning then that, and that is what I like about it.