The Mysterious Old Man(1981)

Original title: Таинственный старик

In the small town of Krutovo, three friends live — Mitrya, Andrian and Lenka. From the director of the Museum of local lore, the children learn about the theft of the portrait "The Old Man with a Candle" from the museum collection of Prince Meshchersky. The valuable painting is somewhere in the city. The guys are starting the search...