A new book on Netaji Subhas Chandra Bose, whose disappearance still remains a mystery, says the Intelligence Bureau doctored British intelligence reports to support the Nehru government's claim that he died in an air crash in Taipei on August 18, 1945. After being sidelined in the Congress, Netaji mysteriously disappeared from India , went to Germany to strike an alliance with Hitler , and later got Japanese assistance to establish the Indian National Army that fought its way almost up to the northeast of India.