The woman was returning in the direction of Waterloo Road!

"Drive slowly back along Waterloo Road," was my next order.
"Pretend you are looking for a fare; I will keep out of sight."

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