Boris Strugatsky

The Doomed City is set in an experimental city whose sun gets switched on in the morning and off at night, a city bordered by an abyss on one side and an impossibly high wall on the other....

When young programmer Alexander Ivanovich Privalov picks up two hitchhikers while driving in Karelia, he is drawn into the mysterious world of the National Institute for the Technology of Witchcraft and Thaumaturgy, where research into magic is serious business....

It is a mysterious city whose sun is switched on in the morning and switched off at night, bordered by an abyss on one side and an impossibly high wall on the other....

Anton is an undercover operative from future Earth, who travels to an alien world whose culture has not progressed beyond the Middle Ages. Although in possession of far more advanced knowledge than the society around him, he is forbidden to interfere with the natural progress of history....