The dawn of the nuclear era began when the US dropped atomic bombs on Hiroshima and Nagasaki, igniting a fierce nuclear arms race. By 1971, Pakistan, having faced defeat in three wars with India, sought vengeance at any cost, aiming to develop a nuclear bomb as a means of intimidation against its neighbor. The Indian intelligence agency, known as RAW, remained vigilant in this escalating conflict.
In this tense atmosphere, Amandeep Singh (Sidharth Malhotra), an IPS officer, operates undercover in Pakistan as a tailor named Tariq in Rawalpindi. His life takes a dramatic turn when he meets Nasreen Hussain (Rashmika Mandanna), a blind woman who frequents his shop. In a beautiful yet tragic romance, Amandeep falls for Nasreen, and despite her father's initial objections to their union, they marry after she expresses her desire for independence, finding liberation in his love.
In May 1974, India conducts its first nuclear test, prompting Pakistan to hastily accelerate its own nuclear program. The government tasks Abdul Qadeer Khan (Mir Sarwar), a prominent nuclear scientist from Pakistan, to spearhead the initiative, transporting him and his family back from Sweden. The nation’s Prime Minister, Zulfikar Ali Bhutto (Rajit Kapoor), greenlights the weapons development, which is cloaked in secrecy, dubbed Project 706. With funds from Col. Gaddafi and uranium sourced from Africa, the race for nuclear capability intensifies.
In a twist of fate, Nasreen discovers she is pregnant in 1977. Concurrently, during the 1977 Indian General Election, India’s leader, Indira Gandhi (Avantika Akerkar), learns from RAW chief R.N. Kao (Parmeet Sethi) of Pakistan's ambitions and orders an investigation into the nuclear facility's location. Amandeep, activated for Mission Majnu, faces the burden of a family history tainted by betrayal, as his father, Ajitpal, is remembered as a traitor.
During his mission, he encounters fellow RAW agents Aslam Usmaniya (Sharib Hashmi) and Raman Singh (Kumud Mishra). Through clever subterfuge, Amandeep secures crucial intel that confirms Pakistan's nuclear ambitions, exploiting opportunities to glean classified information while posing as a tailor. His clandestine conversations with a Brigadier unravel the truth: Pakistan is indeed collaborating with specialists from across the globe, hinting that the nuclear site is obscured within Rawalpindi.
Amidst these high-stakes encounters, a significant political shift occurs. The new Indian Prime Minister, Morarji Desai (Avijit Dutt), advocates for peace and diplomacy, contrary to the aggressive posturing in the region. As the military coup led by General Muhammad Zia-Ul-Haq (Ashwath Bhatt) unfolds, settings change, and Amandeep’s mission stands precariously close to exposure.
Challenges mount when Amandeep's father-in-law grows suspicious of his activities, mistakenly suspecting him of infidelity. This confrontation leads to a violent encounter, but Amandeep soon learns that Aslam has taken down his father-in-law to preserve Amandeep's life.
As political tensions rise, Israel prepares to strike, believing they can neutralize a potential nuclear threat at a Pakistani military facility in Quetta. However, the revelation of the nuclear ambitions at Kahuta falls to Amandeep, who undertakes significant risks to gather irrefutable evidence. Through cunning, he collects hair samples from personnel near the facility, which, once tested back in India, confirms the presence of plutonium.
Despite the gathered intelligence, Prime Minister Morarji hesitates to act, fearing the ramifications of further war. As pressure mounts, and the covert agents are compromised, tragedy strikes—Amandeep sacrifices everything to secure his wife’s escape, allowing her to board a plane while he faces off with pursuing agents of the ISI.
In a poignant conclusion, at the Dubai Airport, Kao encounters Nasreen, reading a heartfelt letter from her late husband that lays bare his true identity. The machinations of love, duty, and sacrifice weave a gripping narrative against a backdrop of national turmoil and personal loss.
