India's biggest cover-up is an investigative insight into the Netaji mystery and its stranger than fiction subplots. Relying heavily on official records bulk of them still security classified in violation of democratic norms the book uncovers a systematic obstruction of justice by the Government of India. First for any book in India, the narrative has been augmented with the excerpts and images of still secret records. Archival material and information obtained under the freedom of information acts of India, the US and the UK has also been made use of.