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Arata meets the mysterious Earl, who claims to be a detective. The two join forces to take risks due to the disappearance of Arata's classmate Harry, and use practical reasoning to find clues to solve the case. As the complicated and confusing case develops, two more friends disappear one after another around Arata. According to the instructions given by the three playing cards at the scene of the crime, the target of the murderer's last playing card is Arata. To this end, he must deal with the mysterious count, the count's young and beautiful female secretary Chalfra, the police who are always paying attention to him, his mother and many other characters. While ensuring his own safety, he must find out the real murderer behind the scenes. --Arata gradually discovered the figure of the criminal approaching him quietly! It is a unique masterpiece of adventure and suspense in the history of literature. Each book is created by top Japanese novelists. It covers a vast area of ​​knowledge, strange cases that span the era, and the history of the East and the West, stimulating the rapid division of your intellectual cells.