The man nodded. It was unlikely that any one would notice the fact that the cab was engaged.
I was borne back again upon my course. The woman kept to the right, and, once we were entered into the straight road which leads to the bridge, I again raised the speaking-tube.
“Pull up,” I said. “On the right-hand side is an old woman carrying a basket, fifty yards ahead. Do you see her? Keep well behind, but don’t lose sight of her.”
The man drew up again and sat watching the figure with the basket until it was almost lost from sight. Then slowly we resumed our way. I would have continued the pursuit afoot now, but I feared that my quarry might again enter a vehicle. She did not do so, however, but coming abreast of the turning in which the mysterious assault had taken place, she crossed the road and disappeared from view.
I leapt out of the cab, thrust half a crown into the man’s hand, and ran on to the corner. The night was now far advanced, and I knew that the chances of detection were thereby increased. But the woman seemed to have abandoned her fears, and I saw her just ahead of me walking resolutely past the lamp beyond which a short time earlier she had met with a dangerous adventure.
Since the opposite side of the street was comparatively in darkness, I slipped across, and in a state of high nervous tension pursued this strange work of espionage. I was convinced that I had forestalled Bristol and that I was hot upon the track of those who could explain the mystery of the dead dwarf.
The woman entered the gate of the block of dwellings even more forbidding in appearance than those which that night had staged a dreadful drama.
As the figure with the basket was lost from view I crept on, and in turn entered the evil-smelling hallway. I stepped cautiously, and standing beneath a gaslight protected by a wire frame, I congratulated myself upon having reached that point of vantage as silently as any Sioux stalker.
Footsteps were receding up the stone stairs. Craning my neck, I peered up the well of the staircase. I could not see the woman, but from the sound of her tread it was possible to count the landings which she passed. When she had reached the fourth, and I heard her step upon yet another flight, I knew that she must be bound for the topmost floor; and observing every precaution, almost holding my breath in a nervous endeavour to make not the slightest sound, rapidly I mounted the stairs.
I was come to the third landing in this secret fashion when quite distinctly I heard the grating of a key in a lock!