Keigo Higashino is the author of more than fifty novels who has been popular in Japan for twenty years. Now every new work of his becomes an event. In his homeland, he has been awarded all the major literary awards and prizes, and his novels have been the basis for dozens of film and film adaptations, splashing out on the screens the gloomy atmosphere of his detective stories. In the fourth volume of the series of books about “Detective Galileo,” the battle between a criminal and a brilliant physicist takes on colossal proportions. And as usual, science helps to find a way out of the most mysterious situations. The Tokyo Police Department receives an anonymous letter from a man calling himself "Devil's Hand". In it, he says that he is planning a series of murders and issues a personal challenge to Teito University assistant professor, Manabu Yukawa. Why did the criminal choose Yukawa as his target? How does he manage to kill people in such a terrible way?