The fourth mysterious letter! The fourth of those letters "posted by the devil and delivered by the devil," as one of the newspapers expressed it!
We all of us remember the really extraordinary agitation of the public as the night of the twenty-fifth of May drew near. And fresh news increased this interest to a yet higher degree.
People heard in quick succession of the arrest of Sauverand, the flight of his accomplice, Florence Levasseur, Don Luis Perenna's secretary, and the inexplicable disappearance of Perenna himself, whom they insisted, for the best of reasons, on identifying with Arsène Lupin.
The police, assured from this moment of victory and having nearly all the actors in the tragedy in their power, had gradually given way to indiscretion; and, thanks to the particulars revealed to this or that journalist, the public knew of Don Luis's change of attitude, suspected his passion for Florence Levasseur and the real cause of his right-about-face, and thrilled with excitement as they saw that astonishing figure enter upon a fresh struggle.
What was he going to do? If he wanted to save the woman he loved from prosecution and to release Marie and Sauverand from prison, he would have to intervene some time that night, to take part, somehow or other, in
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