The game is based on the same named novel by Arkady and Boris Strugatsky. The game action takes place in the planet which was named Arnakar. The Arkanar world is inhabited by people whose technical and social development level is equal to the early Renaissance epoch. A constant historians mission exists on the planet: progressors which live among local people and as it was supposed which passively watch the development of the local society. But some of the progressors decided to cross the law line and started to intrude into the planet’s development...