In 1978, Indian spy Adhir sets out to stop Pakistan from developing its first nuclear bomb. Cut to 2025, Colonel Ashfaq gets a file linked to his grandfather, General Zia Ullah.

In 1978, Prof Rehmat Agha reveals to Adhir Zia's top-secret nuclear plans. In 2025, the NSA, Adhir Dayal, worries about Mariam, an undercover R&AW agent in Abbottabad.

Adhir infiltrates Zia's secret nuclear facility and finds an opportunity at a nearby village. Mariam discovers Ashfaq's secret plans, but her life takes a perilous turn.