In the fall of 1941, the capital of Soviet Karelia, Petrozavodsk, was occupied by Finnish troops. Renamed Jaanislinna ("Fortress on Onego") by the invaders, the city remained under the control of the new rulers for two and a half years. This fundamental study of the Finnish historian Yu. Kulomaa, based on primary sources, is the only one that most fully covers the multifaceted history of Petrozavodsk during the occupation. Published in Russian for the first time.