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I was intrigued to read this book because of an interview with the author Tim Marshall on a podcast discussing the same topic; the book did not disappoint.

The author does go on to explain the question of why we are living in an age of walls, and consequently the rise in nationalism and increasing support for conservative parties.
With the Great Wall of China as the starting point, the author goes on to describe and analyze the walls and divisions in the USA, the Middle East, Africa, Indian Subcontinent, Europe, and finally the UK.
This book was certainly an enlightening read for an amateur on world politics like me and I think would bring the readers back to the age-old question of "Us Vs. Them". The author also gives his view on the idea of a borderless world and further his solution to the problem of walls - "If we do not move more money to where most people are, many of them will try to move to where the money is."

All in all, a timely, enlightening, and deeply interesting read.
I would recommend it to all who are intrigued by the question the author has attempted to answer.