An old geriatrics professor accidentally discovers after a high-school reunion a potion that can rejuvenate anybody and uses it on him and his friends. They all go their new youthful ways but, for most of them, things don't go according to plan.

In 1950 a Western spy is clandestinely parachuted into Communist Romania to retrieve secret WW2 codes and agent lists and also to assist a group of anti-Communist guerrillas escape but the Communist police is setting a trap.

When he tries to arrest a suspect, a police captain find him dead. Investigation will uncover a counterfeiting ring.