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conversation. I also want to know who was in the room with Kara when Gathercole went in."

"H'm," said John Lexman.

"Even if I found who the third person was, I am still puzzled as to how they got out and fastened the heavy latch behind them. Now in the old days, Lexman," he said good humouredly, "you would have made a fine mystery story out of this. How would you have made your man escape?"

Lexman thought for a while.

"Have you examined the safe?" he asked.

"Yes," said the other.

"Was there very much in it?"

T. X. looked at him in astonishment.

"Just the ordinary books and things. Why do you ask?"

"Suppose there were two doors to that safe, one on the outside of the room and one on the inside, would it be possible to pass through the safe and go down the wall?"

"I have thought of that," said T. X.

"Of course," said Lexman, leaning back and