An unexplained disaster turns a small provincial town into an anomalous zone - the Medusa object, full of dangers and mysteries. The government closes the city from the outside world, but insiders constantly penetrate through the cordons and roadblocks - people who, for various reasons, are forced to make money by smuggling valuable artifacts. But what really happened to the city? What strange creatures now inhabit its streets? What do the deadly Amber Fields hide? What scientists cannot cope with will have to be solved by a former resident of the forbidden city, and now an insider, Viktor Kulikov.