Невероятное перемещение

Schoolboy Vanya Fyodorov skips class to take advantage of his parents' absence to test a universal homework computer program he invented. But due to a glitch in the program, instead of the expected paper, Vanya receives three guests from the past, one of whom is none other than Philippus Aureolus Theophrastus Bombastus von Hohenheim, later known as Doctor of Medicine Paracelsus. Vanya and his sister Lisa must, at all costs, return Paracelsus to his former self.…