Transcript for Matt Haig talks about his book, ‘GMA’s’ October Book Club pick ‘The Midnight Library'
Celebrating one year of the "Gma" book club. Will reeve sat down with the best-selling author of our October pick, "The midnight library" and, will, I love how this book is all about life's endless possibilities, isn't it? Yeah, Lara, good morning. This book really resonates with people, myself included. This I marked up all the stuff that spoke to me. It's a story about regret, second chances and answering the question, what could have been. Life is full of endless possibilities. But what if you had the opportunity to try them all out. That's the question author Matt haig asks and tries to answer in his "The New York Times" best-seller "The midnight library," a poignant journey towards self-acceptance. Every book provides a chance to try another life you could have lived. To see how things would be if you had made other choices. Would you have done anything different? If you had the chance to undo your regrets? Think in a way that's what libraries are, places we go to, portals to other worlds. Reporter: 35-year-old Nora seed struggling with depression and regret finds herself in the midnight library, a metaphysical Cal space between life and death after she loses the will to live. It's here she gets the chance to see what could have been if she had become a rock star, an olympic swimmer, the infinite number of lives she had live fundamental she made different choices. Every time Nora goes to a new life, she comes back to the midnight library once she starts to experience disappointment. What's the lesson you were trying to impart through that? On one level it was about the grass not being as green as we think it is when we imagine other lives for ourselves and also if you think about it, if a life is full of regret, you're not really living in the present. You're living in the past. Reporter: For haig writing became a form of therapy. A way to channel his emotions and for his fans an outlet to process and reflect on their own lives. It really made me think about my own life, second chances, and finding the will to notnly survive, but to truly live. This is a book that will touch your soul, sit there and grow in you. This is a line that stuck out to me the lonely mind in the busy city yearns for connection because it thinks human-to-human connect is the point of everything. Seven months into this pandemic how do you judge that statement? It still holes and I think we've been feeling that more than ever. We kind of really value human-to-human connection more than ever before. What are you doing in some of your parallel lives? So I stopped the piano at a young age and I was quite good at it and sometimes wonder, ooh, is there a life where I'm Elton John somewhere? And I think it's gonna be a long, long time I've tried to pick it up a bit again in lockdown. I wonder about if I would have stuck with a musical instrument but I don't really do regrets now. Reporter: The "The midnight library" is a great thought provoking read. It had me thinking about my possible alternative lives. Could I have been a hockey player, a writer, maybe a teacher? Ultimately though and is this a lesson the book imparts I'm pretty happy with the life I'm living right now. Very cool. Will, I'm actually halfway through it and I think it's such a good read and so thought provoking. "The midnight library" out now. You can read an excerpt on our website at goodmorningamerica.com and as always keep read ago long with us on our Instagram @gmabookclub.
This transcript has been automatically generated and may not be 100% accurate.