The book is a collection of extracts from the writings and speeches of Hindu nationalists starting with Maharshi Dayananda Saraswati to Vajpayee as PM. It encompasses writings and views of Hindu Mahasabha leaders, RSS leaders, BJP leaders, various resolutions of these bodies. These are not easy to come by for an interested reader. The author is generally unsympathetic to Hindu cause. But, it does not matter. The author has done good service to readers who have interest in modern and contemporary history of India.
This book is a compilation of extracts from writings of Hindu nationalists. As such it is useful to get a larger picture of the different writers and their ideas. Some of the most interesting extracts are from Swami Dayananda and Swami Shraddhananda. However, a compilation of extracts can only serve as an introduction, it is more worthwhile to read the full texts of an author.
However, the most interesting writings in Hindu nationalism nowadays comes from independent scholars and writers not directly affiliated with Hindu nationalist organisations like the RSS. These are writers like Sita Ram Goel, Ram Swarup, Koenraad Elst, Rajiv Malhotra, Arun Shourie and Harsh Narain - authors which are completely missing in this compilation. Among the writers of the pre-independence period, there are also some names which should have been included (For example, Swami Dayananda is included, but the political writings of Aurobindo are missing).
The author Christophe Jaffrelot has been criticized as being biased against Hindu culture/nationlism and for "Nehruvian prejudice", while turning a blind eye to Islamic or Christian fundamentalism, but unlike many similar writers, he is at least knowledgeable and knows his stuff. For those interested in an introduction to Hindu nationalism, I'd rather recommend "Decolonizing the Hindu Mind" by Koenraad Elst.