Something leaped from the top of the bookcase, ambled silently across the littered carpet, and passed from the library like a golden streak. I stood looking after it with startled eyes. Inspector Weymouth laughed dryly.

"It's a young puma, or a civet-cat, or something, Doctor," he said. "This house is full of surprises—and mysteries."

His voice was not quite steady, I thought, and he carefully closed the door ere proceeding further.

"Where is he?" asked Nayland Smith harshly. "How was it done?"

Weymouth sat down and lighted a cigar which I offered him.

"I thought you would like to hear what led up to it—so far as we know—before seeing him?"

Smith nodded.

"Well," continued the Inspector, "the man you arranged to send down from the Yard got here all right and took up a post in the road outside, where he could command a good view of the gates. He saw and heard nothing, until going on for half-past ten, when a young lady turned up and went in."

"A young lady?"

"Miss Edmonds, Sir Lionel's shorthand typist. She had found, after getting home, that her bag, with her purse in, was missing, and she came back to see if she had left it here. She gave the alarm. My man heard the row from the road and came in. Then he ran out and rang us up. I immediately wired for you."