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Journalist Andriy Krayniy is a true polymath, fluent in living and dead languages, but somehow he hasn't had it easy with material possessions: having lived to the age of Christ, he has no roof over his head. As a homeless man, he is not averse to a warm place to live, even if the cherished key was handed to him by a strange stranger, and the apartment number inspires superstitious fear. Was it manna from heaven or an unfortunate mistake? Soon, Krainey will need two more keys: to the mystery of the disappearance of the owner of apartment number 13 and to the heart of a fatal woman, which is not so easy to reach...