eyes and then blockade you behind that iron curtain! By the way,
Mazeroux, you must get the telephone repaired this morning, so as to keep
in touch with the office. Have you begun your search in these two rooms?"

"As you ordered, Monsieur le Prefet. The deputy chief and I have been
hunting round for the last hour."

"Yes," said M. Desmalions, "that Florence Levasseur strikes me as a
troublesome creature. She is certainly an accomplice. But what were her
relations with Sauverand and what was her connection with Don Luis
Perenna? That's what I should like to know. Have you discovered nothing
in her papers?"

"No, Monsieur le Prefet," said Mazeroux. "Nothing but bills and
tradesmen's letters."

"And you, Weber?"

"I've found something very interesting, Monsieur le Prefet."

Weber spoke in a triumphant tone, and, in answer to M. Desmalions's
question, went on:

"This is a volume of Shakespeare, Monsieur le Prefet, Volume VIII. You
will see that, contrary to the other volumes, the inside is empty and the
binding forms a secret receptacle for hiding documents."

"Yes. What sort of documents?"

"Here they are: sheets of paper, blank sheets, all but three. One of
them gives a list of the dates on which the mysterious letters were
to appear."

"Oho!" said M. Desmalions. "That's a crushing piece of evidence
against Florence Levasseur. And also it tells us where Don Luis got
his list from."

Perenna listened with surprise: he had utterly forgotten this particular;
and Gaston Sauverand had made no reference to it in his narrative. And
yet it was a strange and serious detail. From whom had Florence received
that list of dates?

"And what's on the other two sheets?" asked M. Desmalions.

Don Luis pricked up his ears. Those two other sheets had escaped his
attention on the day of his interview with Florence in this room.

"Here is one of them," said Weber.

M. Desmalions took the paper and read:

"Bear in mind that the explosion is independent of the letters, and that
it will take place at three o'clock in the morning."

"Yes," he said, "the famous explosion which Don Luis foretold and which
is to accompany the fifth letter, as announced on the list of dates.
Tush! We have plenty of time, as there have been only three letters and
the fourth is due to-night. Besides, blowing up that house on the
Boulevard Suchet would be no easy job, by Jove! Is that all?"

"Monsieur le Prefet," said Weber, producing the third