The long-term dream of science fiction writers has come true! Finally, humanity has met alien brothers in mind. But these brothers, although they turned out to be similar to people in appearance (though not all of them and not always), were just as clueless in the field of technology as earthlings were in the field of magic. And vice versa... It was there, in the Worlds inhabited by elves, gnomes, goblins and other evil spirits, that a newly minted employee of the Earth Federation Security Service, Vuko Mrakovich, went on a business trip. With a very secret mission and, naturally, practically impossible.