Aadhaar was born in July 2009, yoking modern technology and management expertise to political will. The biometric-based unique identification system, built by tech czar Nandan Nilekani and his team of innovators, was designed to enable subsidies and social spends reach their true destination, plug institutional corruption and save trillions of tax-rupees. In July 2017, Aadhaar is 1.15 billion identities and growing. In Aadhaar: A Biometric History of India’s 12-digit Revolution, senior journalist Shankkar Aiyar traces the history of this ambitious, controversial undertaking. He speaks with President Pranab Mukherjee, Prime Ministers Narendra Modi and Manmohan Singh, P. Chidambaram, Yashwant Sinha, Rahul Gandhi and others to document how politicians with diametrically opposed ideologies were equally determined to propel Aadhaar. Aiyar maps how Aadhaar’s application expanded beyond its original intent. He researches its ups, downs and turnarounds; discusses the concerns of activists and bureaucrats on potential misuse of the database for state surveillance; raises the urgent need for a data-protection and privacy law and spells out the solutions.