The Mountain of Light is a very interesting book, a work of historical fiction about the Kohinoor diamond. The first two hundred pages read like historical fiction, but then there's a brief suspense/thriller passage. The book returns to historical fiction to finish the tale.
Sundaresan does a lovely job of depicting pre-colonial India, and an unfortunately good job of exposing a little of the underbelly of colonialism. (It was not Great Britain's finest hour, in my opinion.) I think this book is well-written, interesting, and offers a lovely cast of characters. It's also a quick read if you know a little about India during this period, and an easy read even if you don't.