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if it enjoyed doing it. I had just got off to sleep that night when my telephone-bell rang. It was Bobbie, of course. He didn't apologize.
"Reggie," he said, "I've got it now for certain. It's just come to me. We saw those Terpsichorean Cats at a matinee, old man."
"Yes?" I said.
"Well, don't you see that that brings it down to two days? It must have been either Wednesday the seventh or Saturday the tenth."
"Yes," I said, "if they didn't have daily matinees at the Coliseum."
I heard him give a sort of howl.
"Bobbie," I said. My feet were freezing, but I was fond of him.
"Well?"
"I've remembered something too. It's this. The day you went to the Coliseum I lunched with you both at the Ritz. You had forgotten to bring any money with you, so you wrote a cheque."
"But I'm always writing cheques."
"You are. But this was for a tenner, and made out to the hotel. Hunt up your cheque-book and see how many cheques for ten pounds payable to the Ritz Hotel you wrote out between May the fifth and May the tenth."
He gave a kind of gulp.
"Reggie," he said, "you're a genius. I've always said so. I believe you've got it. Hold the line."
Presently he came back again.
"Halloa!" he said.
"I'm here," I said.
"It was the eighth. Reggie, old man, I----"
"Topping," I said. "Good night."
It was working along into the small hours now, but I thought I might as well make a night of it and finish the thing up, so I rang up an hotel near the Strand.
"Put me through to Mrs. Cardew," I said.
"It's late," said the man at the other end.
"And getting later every minute," I said. "Buck along, laddie."
I waited patiently. I had missed my beauty-sleep, and my feet had frozen hard, but I was past regrets.
"What is the matter?" said Mary's voice.
"My feet are cold," I said. "But I didn't call you up to tell you that particularly. I've just been chatting with Bobbie, Mrs. Cardew."
"
