Yet it is evidently a document of importance.

It has been kept carefully in a pocket-book; for the one side is as clean as the other." "It was in his pocket-book that we found it." "Preserve it carefully, then, Miss Morstan, for it may prove to be of use to us.

I begin to suspect that this matter may turn out to be much deeper and more subtle than I at first supposed.

I must reconsider my ideas." He leaned back in the cab, and I could see by his drawn brow and his vacant eye that he was thinking intently.

Miss Morstan and I chatted in an undertone about our present expedition and its possible outcome, but our companion maintained his impenetrable reserve until the end of our journey.
It was a September evening, and not yet seven o'clock, but the day had been a dreary one, and a dense drizzly fog lay low upon the great city.
Mud-colored clouds drooped sadly over the muddy streets.