Shortly after independence India faces terrorists attacks in Assam, resulting in many deaths and casualties. A group of concerned citizens, who are not connected with the Government, decide to do something to stop this carnage. While Salim is already at work in Beirut, his cover is blown and he is shot dead. 

Now Sunil Mehra must travel to Beirut and take over from Salim. Once there, he meets a former flame, Meenakshi Mehta, and also a female admirer by the name of Zenab. The terrorists are headed by a man named Syed, who deputes one of his assistants, Madame, to spy on Sunil's dad, Diwan Chand Mehra, by posing as Mehra's daughter's aunt, forcing her to obey by abducting her son, Babloo, and holding him captive. Soon Syed and his associates, including Doctor X and Captain find out all secrets of Mehra, as a result of which Sunil is trapped and held by Syed. Then Diwan's world is shattered when Meenakshi telephonically informs him that Sunil has been killed. 

The question remains what will happen to Babloo, Diwan, and the rest of the concerned citizens, especially when they have become vulnerable due to Madame's presence in their very household.