Lt. Kojak arrives in Budapest as a guest speaker for the 'International Crime Writers Conference'. Soon after he starts enjoying the pleasures that the city has to offer, he assists his old friends at the police department with a case. The case involves solving the murder of a noted scientist, unaware that a Mafia hit man and his female companion are targeting him.

The story of a young servant girl who comes to work on the construction site of a large-scale industrial settlement. She decides to embark on an independent life, runs away from her foster parents, gets on a train and sets out to earn money. Modest and shy, she joins the factory's group of "Stakhanovites" and soon makes new comrades. Her coworkers accept her into their team.