The Indian Government has developed plans for an aircraft that would take the country's air force to greater strength and position in the world. Obviously there are people interested in stealing those plans and selling them off to foreign lands at a huge price. Among them are Ajit and Jeevan. Jeevan's assistant Sudhir manages to steal the briefcase that has the microfilm of the plans plus jewellery worth Rs 50 lakhs. But he is apprehended by the police and sent to prison, but not before he hid the briefcase. Now, Jeevan and Ajit try to persuade Dev Anand (the clever jailbreaker Rocky) to get into that prison and force Sudhir to tell him where the microfilm is. In the interim, there is this cabaret dancer (Hema Malini) who is interested in the briefcase for the jewellery only. So, then begins the thriling story of how Dev gets into the prison and gets Sudhir out of it, only to know that Ajit has already got hold of the briefcase but is afraid to open it lest he damages the microfilm. How Dev Anand (is he actually Rocky?) and Hema (who is transformed into a desh-bhakt after one small speech by Dev!) stop the villains from getting hold of the microfilm is the rest of the film. Also, in the process, Dev gets to know who his father is (which is a surprise, and probably did not need to be incorporated in the film), and is united with his mother and beloved.