Ahnenerbe, an organization called "ODESSA". What do we know about them? Three worlds, identical and completely different. Our world, the world of the Commune, the third world, in which there is an acute problem of lack of electricity. Yura, the main character, by chance finds himself from world to world, where he meets different people, customs, and problems. The problems are the same everywhere, but all worlds see their solution differently. Temporal laboratories, institutes of space and time. Riddles that Yuri Knyazev and his friends, employees of the FSB special unit Sigma, will have to solve.