Destined to be a classic.
For me, one of the best books I've read in DECADES. I am blown away by the talent and craft of the author, Matt Haig. The weaving of physics, metaphysics, philosophy, science and even travel into a story with an M/C that was highly relatable puts this book in my top 5 'Best Book Ever' list.
Now, I should tell you, reader of this review, that I listened to this book on audible and Carey Mulligan was an exceptional narrator which may have swayed my star rating. However, I don't think so. I listened closely to the story, the writing, the pace, the references, etc...and if I could give a 7-star rating like the hotel Burj Al Arab hotel in Dubai, I would. The stars I give this book are off the chart.
If you read this book, don't expect to the have same reaction as me because like when someone says, "OMG that movie was amazing - the best ever!" and then you watch it and you have incredibly high expectations going in, you might risk being let down. I wish that NOT to happen to you with this book. Go in with an open mind and hopefully enjoy the read as much as me.