Brian, I do not know a book with the same topic, but if what you liked about the book A Thousand Splendid Suns was its capability to take the reader to another far away world as if it's on another planet and keep you immersed and on your toes then I recommend the following books which do that in a similar writing style:
Alchemist by Paul Coelho
Autobiography of a Yogi by Yogananda Paramhansa
The Old Man and the Sea by Ernest Hemingway
Chess novel by Stefan Zweig
Kokoro by Soseki Natsume
Siddharta by Hermann Hesse
And there is a film that you might like since you like the mentioned book and that film is Incendies by Denis Villeneuve.