Polina Svirskaya felt: they will not be allowed to rest in peace! She and her husband, investigator Sergei Dulo, climbed almost to the edge of the earth - the shore of Lake Baikal, but work overtook him there too! Sergei was asked to help local detectives investigate a daring crime: bandits attacked a car transporting gold from a mine, killed the guards, seriously wounded the driver and stole valuable cargo. Sergei plunged headlong into his usual work, but Polina did not waste any time. Having met a colorful old man, a local historian, she became seriously interested in the search for the legendary gold of Kolchak - according to legend, during the Civil War, several wagons with ingots fell to the bottom of Lake Baikal and have not yet been found...