"Good-bye, Daisy!" said Lupin, trying to jest, but really overcome with rage.

He eyed his accomplices in the hope that one of them would venture to give a mocking smile. How pleased he would have been to vent his nerves on them!

"Let's go home," he said to his companions.

He gave them some dinner; then he smoked a cigar and they set off again in the car and went the round of the theatres, beginning with those which were giving light operas and musical comedies, for which he presumed that Daubrecq and his lady would have a preference. He took a stall, inspected the lower-tier boxes and went away again.

He next drove to the more serious theatres: the Renaissance, the Gymnase.

At last, at ten o'clock in the evening, he saw a pit-tier box at the Vaudeville almost entirely protected from inspection by its two screens; and, on tipping the boxkeeper, was told that it contained a short, stout, elderly gentleman and a lady who was wearing a thick lace veil.

The next box was free. He took it, went back to his friends to give them their instructions and sat down near the couple.

During the entr'acte, when the lights went up, he perceived Daubrecq's profile. The lady remained at the back of the box, invisible. The two were speaking in a low voice; and, when the curtain rose again, they went on speaking, but in such a way that Lupin could not distinguish a word.

Ten minutes passed. Some one tapped at their door. It was one of the men from the box-office.

"Are you M. le Depute Daubrecq, sir?" he asked.

"Yes," said Daubrecq, in a voice of surprise. "But how do you know my name?'

"There's a gentleman asking for you on the telephone. He told me to go to Box 22"

" But who is it?"

"M. le marquis d'Albufex."

"Eh"What am I to say, sir?"

"I'm coming... I'm coming... "

Daubrecq rose hurriedly from his seat and followed the clerk to the box-office.

He was not yet out of sight when Lupin sprang from his box, worked the lock of the next door and sat down beside the lady.

She gave a stifled cry.

"Hush!" he said. "I have to speak to you. It is most important."

"Ah!" she said, between her teeth. "Arsene Lupin!" He was dumbfounded. For a moment he sat quiet, open-mouthed. The woman knew him! And not only did she know him, but she had recognized him through his disguise! Accustomed though he was to the most extraordinary and unusual events, this disconcerted him.

He did not even dream of protesting and stammered:

"So you know?... So you know?... "

He snatched at the lady's veil and pulled it aside before she had time to defend herself:

"What!" he muttered, with increased amazement. "Is it possible?"

It was the woman whom he had seen at Daubrecq's a few days earlier, the woman who had raised her dagger against Daubrecq and who had intended to stab him with all the strength of her hatred.

It was her turn to be taken aback:

"What! Have you seen me before?... "

"Yes, the other night, at his house... I saw what you tried to do... "

She made a movement to escape. He held her back and, speaking with great eagerness: