Professor Harbanslal is engaged in a search for a lost civilisation in the Nangla valley. He succeeds in his quest but gets caught in a bitter storm. He messages his son that he may not survive the storm when he suddenly spots a tent. Unknown to him, inside the tent the villainous Vikram and his son Bahadur are searching for the lost treasures buried with the same civilisation. They capture the hapless professor and try to torture the location of the ruins out of him. However, they are unable to decipher the Professor’s notes.
Vikram and Bahadur are in cahoots with Williams, who has gathered an international ring of criminals to finance their expedition to the Nangla Valley. Ever resourceful, Vikram also has other tricks up his sleeve. He has kidnapped the son and wife of millionaire Rajendra Jain. He is blackmailing Rajendra Jain to force him to arrange his daughter Ritu’s marriage with Bahadur, in order to get his hands on the property rights to Nangla valley. In a particularly gruesome bit of blackmail he sends Rajendra Jain his wife’s severed finger. Ritu is willing to accept the marriage in order to save her mother and son. Soon preparations are underway.
A charismatic musician performs at Ritu and Bahadur’s wedding. As the wedding commences, the police raid the venue. It is revealed that the musician is notorious criminal Natwarlal. Natwarlal kidnaps Ritu and escapes from the police. Their car breaks down and they hitchhike with a man named Jimmy. The street-smart Jimmy quickly figures out the situation and takes Natwarlal and Ritu hostage. It turns out that Jimmy is an escaped convict and he demands a reward from Vikram and Rajendra Jain in exchange for Ritu. Things take a different turn when Vikram stumbles upon notes similar to the Professor’s in Natwarlal’s possession. Natwarlal claims to have been a student of Professor Harbanslal and offers to show them the way to the ruins, in exchange for Ritu’s hand in marriage. A desperate Vikram agrees. Soon it is revealed that both Natwarlal and Jimmy are actually undercover police officers who were investigating Rajendra Jain’s involvement with the criminals. Natwarlal is Ashwini Kumar, the Professor’s son.
Ashwini soon figures out that Rajendra Jain is being blackmailed. Ritu too follows Jimmy one day and figures out the truth. As the story moves to the frozen heights of Nangla Valley, the three join forces to foil the avaricious criminals. They also enlist the help of Bahadur’s disillusioned assistant who felt betrayed by his decision to marry Ritu. Ashwini and the others keep finding ways to trick the criminals into giving them more access and power. The events take a turn for the sinister once they are caught trying to free Ritu’s mother and brother. Professor Harbanslal is brutally gunned down in front of Ashwini. Ultimately they manage to trap all of the criminals (including Williams and his international gang) in the ruins, and they are all dispatched one by one.