According to legend, the ancient scientist Al-Maghribi invented the amazing astrolabon device. With its help it was possible not only to determine the exact astronomical time and coordinates of celestial bodies, but also to be transported in time and space. Al-Maghribi's contemporaries treated the amazing device with understandable distrust, and soon the scientist disappeared and everyone forgot about him. After all, it’s hard to believe in something that defies reason. St. Petersburg housewife Nadezhda Lebedeva thought so, until she found herself involved in a series of strange thefts, which at first she didn’t attach any importance to. However, when a strange tenant settled in her house, speaking only in numbers, she realized that this was the key not only to crimes, but also to comprehending secret knowledge.