“You went to show Yeh Ling where the old man kept some of his secret documents, in the fake brick in the fireplace. You went hoping that in that box there were some papers which related to you and you were disappointed. The only thing I am in doubt about is this—was Yeh Ling disappointed too?”
She shook her head.
“I wondered,” mused Carver. “Of course, I guessed that it was in the little lacquer box, and guessed also that the little lacquer box had a false bottom. Am I right?”
She shook her head again.
“No—Yeh Ling thought it was there; the document he sought was in the brick-box.”
“You have the key of Mayfield,” said Carver. “I think you had better give it to me. Otherwise, you may be getting into serious trouble.”
She went out of the room without a word, came back and handed him the small yale key, which he glanced at and dropped into his pocket.
“If I were a writing man, which, thank heavens, I am not,” he said, “I should carry this story of the Trasmere murder, the ‘Mystery of the Three Keys.’ Here is one solved, and it wasn’t much of a mystery. There are two others. The third is the most difficult of all.”
“You mean the key that was found on the table in the vault?”
He nodded.