There was only one way of finding out, which was to enter the house himself. He did not hesitate. But the man must have seen him as he crossed the belt of light cast by the gas-jet and made his way to the steps, for the glimmer suddenly went out and Shears did not see it again.
He softly tried the door at the top of the steps. It was open also. Hearing no sound, he ventured to penetrate the darkness, felt for the knob of the baluster, found it and went up one floor. The same silence, the same darkness continued to reign.
On reaching the landing, he entered one of the rooms and went to the window, which showed white in the dim light of the night outside. Through the window, he caught sight of the man, who had doubtless gone down by another staircase and out by another door and was now slipping along the shrubs, on the left, that lined the wall separating the two gardens:
"Dash it!" exclaimed Shears. "He'll escape me!"
He rushed downstairs and leapt into the garden, with a view to cutting off the man's retreat. At first, he saw no one; and it was some seconds before he distinguished, among the confused heap of shrubs, a darker form which was not quite stationary.
The Englishman paused to reflect. Why had the fellow not tried to run away when he could easily have done so? Was he staying there to spy, in his turn, upon the intruder who had disturbed him in his mysterious errand?
"In any case," thought Shears, "it is not Lupin. Lupin would be cleverer. It must be one of his gang."
Long minutes passed. Shears stood motionless, with his eyes fixed upon the adversary who was watching him. But, as the adversary was motionless too and as the Englishman was not the man to hang about doing nothing, he felt to see if the cylinder of his revolver worked, loosened his dagger in its sheath and walked straight up to the enemy, with the cool daring and the contempt of danger which make him so formidable.
A sharp sound: the man was cocking his revolver. Shears rushed into the shrubbery. The other had no time to turn: the Englishman was upon him. There was a violent and desperate struggle, amid which Shears was aware that the man was making every effort to draw his knife. But Shears, stimulated by the thought of his coming victory and by the fierce longing to lay hold at once of this accomplice of Arsène Lupin's, felt an irresistible strength welling up within himself. He threw his adversary, bore upon him with all his weight and, holding him down with his five fingers clutching at his throat like so many claws, he felt for his electric lantern with the hand that was free, pressed the button and threw the light upon his prisoner's face:
"Wilson!" he shouted, in terror.