4321 by Paul Auster

I have not had the greatest of reading years,so when the Booker Prize list came out, I was pretty happy to see that I had already read two of them, and was in the middle of a third.  A mitigating factor is that they have now increased the scope of nominees to include all literature written in English, so there are some US nominees, which helped.
That said, this is also the first year that my husband read a nominee before I had.  A fact he is very proud of and with good reason, because it is a lengthy and non-linear story.
That said, this is an incredible read.  It is almost cinematic in it's scope, with the theme of multiple story threads with multiple possible outcomes to each of those threads.
Archibald Ferguson is our main character, and we hear his story in four different versions, over the many years of childhood into adulthood, each version with a different path taken and therefore a different outcome.  There are some interlinked themes along the way, people who he meets at different points in his life who resonate for him.  So there are constants and there are differences, but it is all interesting, and unlike some other books with sweeping scopes, the main character is largely likable.  Even when his choices are not.

It is beautifully written (something highly correlated with the Booker Prize) and thought provoking, and most importantly, holds ones interest over the course of a very long book.