A relatively little-known book by the great domestic science fiction writer Alexander Belyaev . The sci-fi theme here is skillfully intertwined with the genre of the adventure novel. American journalist, Moscow correspondent of the New York Times Clayton flies to Altai to find the missing Professor Mikulin . Clayton to find the missing, but the most surprising is not this . Mikulin, it turns out, managed to organize a real scientific laboratory in the taiga, where in practice he proves his theory of the transformation of some chemical elements into others under the influence of mysterious "pee rays". For example, Bismuth is in gold...