I knew who it was at once. It was the most hideous ill-fortune. I answered gruffly, and without turning my head.

"Folkestone Harbour!"

I thought that after that she must surely go away. But she did nothing of the sort. She came and leaned over the rail by my side.

"You are Mr. Arnold Greatson, are you not?"

My heart sank, and I could have cursed my folly for leaving my cabin. However, since I was discovered there was nothing to do but to make the best of it.

"Yes, I am Arnold Greatson," I admitted.

"I wonder if you know who I am?" she asked.

"You are the Princess Adelaide of——"

She held up her hand.

"Stop, please! I see that you know. For some mysterious reason I am travelling almost alone, and under another name which I do not like at all. You are very fond of my cousin, Isobel, are you not, Mr. Greatson?"