Ashok Roy (Dharmendra) has every material wealth but has never known the love of parents. So with a special place in his heart for orphans, he together with his friend Mahesh (Mehmood) run an orphanage called Parvati Mandir. His first meeting with Seema (Hema Malini), the niece of the Inspector General of Police fails to impress, but when he generously signs a cheque of Rs 3 lakhs in aid of the Defence Forces, she begins to see him in a whole new light. The acquaintance blossoms into love, arousing the rage of Ramesh (Prem Chopra), Seema's now out-of-favour fiancée. Ramesh's jealousy drives him to seek the help of Ajit, the leader of a gang of smugglers, in whose hands Ramesh is a mere puppet because Ajit knows his terrible secret…that Ramesh is not actually the grandson of Rai Bahadur Jwala Prasad. From here, the story takes exciting twists and turns. Ramesh and his henchmen try to kill Ashok at Seema's dance show. They fail but succeed in abducting Seema. Meanwhile, Professor Choudhry discovers that Ashok is his long lost son and the real grandson of Rai Bahadur Jwala Prasad. But before he can claim his beloved son as his own, another new secret seals his lips. Ashok has a secret life - as the notorious night robber Jugnu, Why does Ashok lead a double life? Does he save his beloved Seema and ever be united with his family?