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.

Trapped in Ashfaq's mansion, Mariam must follow the NSA's dangerous extraction plan. In 1978, Jyoti falls victim to an attack, and Adhir finds an ally to stop Zia's nuclear plans.