Quick recap
Rudolf Kesselbach, a South African diamond millionaire, is robbed and murdered in a Paris hotel, with an Arsène Lupin calling card pinned to his body. Except Lupin never kills. Even with the police and Sûreté chief Lenormand on the case, two more people die. The only clues are a cigarette case marked L. M. and a label reading 813. Lupin sets out to find the real killer and clear his name, while chasing a secret Kesselbach held that reaches into European politics. It's one of the longest, most ambitious books in the series, with twists about who's who right to the end.
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