Winner of the Goodreads Choice Award for Fiction | A Good Morning America Book Club Pick | Independent (London) Ten Best Books of the Year

"A feel-good book guaranteed to lift your spirits."—The Washington Post

The dazzling reader-favorite about the choices that go into a life well lived, from the acclaimed author of How To Stop Time and The Comfort Book.

Somewhere out beyond the edge of the universe there is a library that contains an infinite number of books, each one the story of another reality. One tells the story of your life as it is, along with another book for the other life you could have lived if you had made a different choice at any point in your life. While we all wonder how our lives might have been, what if you had the chance to go to the library and see for yourself? Would any of these other lives truly be better?