The Teeth of the Tiger (Arsène Lupin Book 7)

A large inheritance is up for grabs-and a murderer is on the loose-in the series that inspired the Netflix show Lupin. When a wealthy man named Cosmo Mornington dies, he leaves an immense inheritance to any living heir that can be found, and names his dear friend Don Luis Perenna as executor. But Mornington's heirs aren't easy to locate. By provision of the will, if none turn up after three months, the full sum of one hundred million francs will go to Perenna himself .