The movie story deals with Ajit Singh (Dharmendra), an illiterate truck driver learns from his dying adoptive mother, that he is the only surviving son of an honest cop who was killed and his entire family obliterated by the dreaded dacoit Bharat Thakur (Ajit) and swears revenge. On his way to Dinapur, the dacoit's hideout he meets a grievously injured cop Inspector D'souza (Satyen Kappu) who dies protecting his stash of ammunitions from local dacoits.Inspector D'souza was en route to the village of Dinapur to set up a Police station with his men and the ammo and he leaves the weapons at Ajit Singh's disposal before succumbing to his wounds.Ajit Singh uses this new found stash of machine guns and grenades to pose as a cop and sets up a police station in the aforementioned village with the help of the villagers.
His love interest is the feisty and pretty village belle Radha (Hema Malini),who is the niece of dreaded dacoit Bharat Thakur but hates his ways and supports Ajit Singh. Bharat Thakur himself is a cunning man and he sets up his man, the village drunkard Chandi (Keshto Mukherjee) as a spy within the village police station nexus. The rest of the film follows the struggle between Ajit Singh and Bharat and how he goes about taking his revenge and thus fulfilling his Pratigya (Promise)..
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