Besides, that is a plain letter from the head of a business firm to--shall we say a client?
There's nothing in it to conceal." "At the same time," Sir Edward remarked, "it might have been as well to have fastened the flap of the envelope." Mr.Coulson held out his hand.
"Let me look," he said.
Sir Edward gave it into his hands.

Mr.Coulson held it under the electric light.

There was no indication in his face of any surprise or disturbance.
"Bit short of gum in our stationery office," he remarked.
Sir Edward was looking at him steadily.
"My impressions were," he said, "when I opened this letter, that I was not the first person who had done so.

The envelope flew apart in my fingers." Mr.Coulson shook his head.
"The document has never been out of my possession, sir," he said.

"It has not even left my person.