"And?"
"We also received this registered letter from Montreal. That's where the blank wall comes in."
"How?"
"We've no record of that letter ever going out of our office."
He looked at me as though he expected me to be more electrified than I found it possible to be.
"Lost, stolen, or strayed?" I asked.
"That's what I'd give my eye-teeth to know," he solemnly asserted.
"But where do you come in?"
His answer was given without the slightest shade of emotion.
"I signed for the letter."