her speed.

He ran on, sure of overtaking her in the passage she had now entered,
for she seemed to be only walking, while he was pursuing her at a
headlong pace. But in the narrow tunnel, when he reached it, she was
not, though at the farther end he imagined that the fold of a black
garment was just disappearing. He emerged into the street, in which he
could now see in both directions to a distance of fifty yards or more.
He was alone. The rusty iron shutters of the little shops were all
barred and fastened, and every door within the range of his vision was
closed. He stood still in surprise and listened. There was no sound to
be heard, not the grating of a lock, nor the tinkling of a bell, nor the
fall of a footstep.

He did not pause long, for he made up his mind as to what he should do
in the flash of a moment's intuition. It was physically impossible that
she should have disappeared into any one of the houses which had their
entrances within the dark tunnel he had just traversed. Apart from the
presumptive impossibility of her being lodged in such a quarter, there
was the self-evident fact that he must have heard the door opened and
closed. Secondly, she could not have turned to the right, for in that
direction the street was straight and without any lateral exit, so that
he must have seen her. Therefore she must have gone to the left, since
on that side there was a narrow alley leading out of the lane, at some
distance from the point where he was now standing--too far, indeed, for
her to have reached it unnoticed, unless, as was possible, he had been
greatly deceived in the distance which had lately separated her from
him.

Without further hesitation, he turned to the left. He found no one