During one of his photographic sessions with Raja Sahab (Rehman), a priceless diamond is stolen by Panna (Zeenat Aman) and hidden in Heera's car.

While Heera describes to her how he met Reema on a plane, how they fell in love, and the tragic accident resulting in her death, Panna narrates how she was tempted by Anil (Dheeraj Kumar) and ultimately forced into joining the dark world of theft and robbery.

Hearing all this, Heera remembers how Reema once told him to take care of her sister and vows to save her from the ruffians.

Soon Anil and his men along with Hari's (Jeevan) goons (the group's mastermind) reach Heera and Panna's hiding place.

In the confrontation that takes place, they fail to snatch the diamond away from Heera, but Panna gets hit fatally and eventually succumbs to her wounds.