In 1971, Amandeep “Aman” Singh IPS is a deep cover RAW field operative, who is in Pakistan on an undercover assignment under the pseudonym Tariq Hussain. Along the way, Aman falls in love with Nasreen Hussain, a blind girl and the two get married. In May 1974, India conducted its first nuclear test, due to which Pakistan secretly rushed to build its own nuclear weapon with the help of nuclear engineer Abdul Qadeer Khan.
During the 1977 Indian general election campaign, Prime Minister Indira Gandhi is appraised of the situation by RAW Chief R. N. Kao, and she directs him to find the location of the nuclear facility. Kao assigns the mission to Aman. Aman’s handler, Sharma, informs him of his new mission named “Mission Majnu”. Along the way, Aman meets two other RAW agents – Aslam Usmaniya and Raman Singh (under the pseudonym Maulvi Saab), who are stationed in Pakistan. Aman manages to gather information that Pakistan is indeed making a nuclear weapon.
Following a general election in India, a new government is formed and its new leader and new Prime Minister Morarji Desai believes in building relationships through diplomacy and peaceful means, and is against any form of warfare including spying and intelligence gathering. Kao resigns to keep the operation in Pakistan going, and hidden from the Prime Minister. In the meantime, Israel is readying an attack on the Quetta military facility, wrongly believing it to be a nuclear weapon facility. Aman manages to locate the nuclear facility in Kahuta, but is unable to collect physical evidence.
