813 (Maurice Leblanc)

813 is the fourth book in the Arsène Lupin series. When one of Arséne Lupins victims is found dead in a way that implicates him, he insists on heading the police search for the real murderer. The mystery involves finding a package of letters once written to Bismarck, locating a clock on which the number 813 has significance, as well as causing a reigning emperor to make several journeys incognito. 813 is preceded in the Arsene Lupin series by The Hollow Needle, and is followed by The Crystal Stopper.