1333. Mysterious things are happening in the capital of the Golden Horde. In the inn, a guest disappeared from a room locked from the inside. Where did the foreigner who called himself an alien from the sunset countries come from in Sarai? Who is involved in his mysterious disappearance: sorcerers from secret monasteries in the Mordovian forests, Bulgarian merchants or papal envoys? Why is the beloved wife of Khan Uzbek, domineering and insidious Taydula, concerned about his fate? The assistant to the Sarai emir was entrusted with dealing with all this. He does not yet know how far his trail will lead.