The Return of Sherlock Holmes.

EXCERPT: 

"Well, I've a conscience, sir, and when I chanced to see you go into
this house, as I came hobbling after you, I thought to myself, I'll just
step in and see that kind gentleman, and tell him that if I was a bit
gruff in my manner there was not any harm meant, and that I am much
obliged to him for picking up my books."
 
"You make too much of a trifle," said I. "May I ask how you knew who I
was?"
 
"Well, sir, if it isn't too great a liberty, I am a neighbour of yours,
for you'll find my little bookshop at the corner of Church Street,
and very happy to see you, I am sure. Maybe you collect yourself, sir.
Here's BRITISH BIRDS, and CATULLUS, and THE HOLY WAR--a bargain, every
one of them. With five volumesyou could just fill that gap on that
second shelf. It looks untidy, does it not, sir?"