It was no very unusual thing for Mr. Lestrade

It was no very unusual thing for Mr. Lestrade, of Scotland Yard, to look in upon us of an evening, and his visits were welcome to Sherlock Holmes, for they enabled him to keep in touch with all that was going on at the police headquarters. In return for the news which Lestrade would bring, Holmes was always ready to listen with attention to the details of any case upon which the detective was engaged, and was able occasionally, without any active interference, to give some hint or suggestion drawn from his own vast knowledge and experience.

On this particular evening, Lestrade had spoken of the weather and the newspapers. Then he had fallen silent, puffing thoughtfully at his cigar. Holmes looked keenly at him.
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