This is a well researched book, it took Dalrymple just over 4 years and addresses a history of British India you won't find elsewhere, the integration of British and other European settlers into India and how they inter-married, converted to Islam, etc
All these things are now conveniently forgotton in the events that followed where the Victorian imperial prejudices are now thought of as having existed from the beginning. Dalrymple shows that this is not so and far more integration and mingling happened in the early years.
The book itself follows the relationship of James Kirkpatrick, the British resident, in Hyderabad in detail and combines it with the background and history of other characters and events relevant to the story. I found the style worked well but could sometimes be too much of a tangent to the main story especially if you're already familiar with the history.
I'd recommend this book to anyone with an interest in Indian history or the life of officers of the Honourable East India Company.