"What do you mean by writing the name of the place in invisible ink?"
"Never did such a thing, sir. Don't know anything about invisible ink."
"Well, how do you explain it, then? This card had the name written in invisible ink. It was discovered by the Post Office in London, and they've returned it for inquiries. What have you to say?"
"What I said before, sir: I didn't do it."
"You write to Henry Smith, 563 Pentonville Road?"
"Never heard of him, sir."
"What's the game, then? Go and fetch the post corporal," he said to his servant.
The man came in with a bundle of recently collected cards in his hand.
"Look at this," said the captain, showing him the card in question. "Did you get that from Murgatroyd?"
"I couldn't say, sir; I get such a lot."