I went into the hall, looked into either room, and hesitated.

Then I fell to upon the door-knocker and gave a loud rat-tat-too, and followed this up with an amiable “Hel-lo!”

For a time no one answered me, and I stood listening and expectant, with my fingers about my weapon. Some one moved about upstairs presently, and was still again. The tension of waiting seemed to brace my nerves.

I had my hand on the knocker for the second time, when Puss appeared in the doorway.

For a moment we remained staring at one another without speaking. Her hair was disheveled, her face dirty, tear-stained, and irregularly red. Her expression at the sight of me was pure astonishment. I thought she was about to say something, and then she had darted away out of the house again.

“I say, Puss!” I said. “Puss!”

I followed her out of the door. “Puss! What’s the matter? Where’s Nettie?”

She vanished round the corner of the house.

I hesitated, perplexed whether I should pursue her. What did it all mean? Then I heard some one upstairs.

“Willie!” cried the voice of Mrs. Stuart. “Is that you?”