Ashok Roy (dharmendra) is rich, popular, and of good character. He runs an orphanage. Seema, the niece of a police inspector, is engaged to Ramesh, but is attracted to Ashok, especially when she finds he gives generously to charity. Ramesh (Prem Chopra) is in fact a villain, working for Ajit in order to maintain his fictitious life as a fake grandson of Rai Bahadur Jwala Prasad. Ramesh attempts to murder Ashok, and kidnap Seema. Ashok survives and determines to rescue and marry Seema, but a mysterious statue holds the clue that in fact Ashok is both the real "lost" grandson and "Jugnu" (The Glowworm) - a robber..
Dharmendra hits his stride in this exciting Bollywood action melodrama where he plays a rich man masquerading as Jugnu (Firefly), a part Robin Hood type character, and part James Bond desh premee hero, who is, unknown to him, a heir to millions. As you can tell, it's influenced by James Bond and heist films and is full of fights, car chases, gadgets and a villain with a steel hand with a blade attached. The villainy is high-level - you got three of them - Prem Chopra, Ajit and Manmohan Desai - and of course, you got Pran, but he's a good guy. There's also romance, nice songs and music background. Dharmendra is at the top of his form, and is equally good at romance, action and dialogue. Hema Malini is beautiful and her chemistry with Garam Dharam is amazing.