Translate the text into English. One of the world's top grandmasters, Arkady Balagan, is the smartest, but rather arrogant. His life changes completely when he becomes a witness to the murder of his Canadian fiancee near the Huxley Hotel, where Arkady had played several games. Life inside the hotel walls seems safe to Balagan, and now he has no intention of leaving his room. When the funds for lodging run out, Arkady finds a use for his analytical mind. Now he helps the police in solving murders, despite his agoraphobia.