"There's plenty for us to see into, I'm thinking!" Bryce laughed and pointed to a shelf of books near the fireplace.
"Do you know what Napoleon Bonaparte once gave as sound advice to police ?" he asked.

"No! Then I'll tell you.

'The art of the police,' he said, 'is not to see that which it is useless for it to see.' Good counsel, Mitchington!" The two men went away through the midnight streets, and kept silence until they were near the door of Jettison's hotel.

Then Mitchington spoke.
"Well!" he said.

"We've had a couple of tales, anyhow! What do you think of things, now ?" Jettison threw back his head with a dry laugh.
"Never been better puzzled in all my time!" he said.