Muz, ktorý sa nevrátil

Police Lieutenant Vlado Hronec, together with the curious journalist Zvar, first search for the thief of important production documents, which they might be interested in even behind the Iron Curtain. At first, they think that engineer Kovalský stole them and fled with them across the border. However, when it is discovered that someone killed Kovalský, they have to start the investigation all over again...