Kamila Housková (
Gabriela Vránová), a student at the School of Applied Arts in Prague working part-time at an engravers' cooperative, arrives at the main police station with important information. A customer has come to the engraving workshop where she works asking them to make a cast of an old coin. The problem is that the coin, as the girl was to find out, was originally part of the well-known treasure of a ninth-century Byzantine merchant, which was supposed to have been completely destroyed by fire during an air raid in the Second World War. The young criminologist Exner (
Jirí Vala) doesn't take the enthusiastic blonde too seriously but, since he quite fancies her, he finally offers to help her.
—NFA.cz