Treasure (2016)

Gosha, a clever and inquisitive boy from a small town, and Katya, a girl from Moscow, who is a friend of his and together they crack the case of a burglary at the Museum of Local History. According to legend, the medallion stolen from the museum holds the key to finding treasures that were hidden by the White Knight. Not long before the museum was robbed, a traveling circus just happened to come to town.