If you are looking for or essay themes based on this book, here are a few ideas:
In this travelogue, Theroux retraces the epic journey he took thirty years earlier in his classic The Great Railway Bazaar . He travels through Eastern Europe, Central Asia, India, and Southeast Asia, reflecting on how the world—and he himself—has changed over three decades.
The full title of the book you're referencing is by Paul Theroux , published in 2008.
Evaluate Theroux's critiques of the cultures he visits—is he a keen observer of truth, or is his perspective clouded by Western bias?