- The Last Empress: The Life and Times of Maharani Gayatri Devi (1999): This biography tells the story of Gayatri Devi, the Rajmata of Jaipur and one of the most influential women in Indian history.
- Blood and Silk: Power and Politics in India (2010): This book provides an insider's view of Indian politics, spanning the years from independence to the present day.
- Untold: Remembering My Mother (2017): This memoir explores Louis' personal journey of coming to terms with his mother's death.
- The Jewel Box (2021): This novel is a gripping tale of love, loss, and betrayal set against the backdrop of the opulent world of Indian royalty.
In addition to these works, Louis has also contributed to various publications, including The New York Times, The Wall Street Journal, and The Guardian. He is known for his insightful analysis and evocative writing style.