Sir Arthur Conan Doyle 
The Adventure of the Red Circle [PDF ebook] 

The Adventure Of The Red Circle by Arthur Conan Doyle – Mrs. Warren, a landlady, comes to 221B Baker Street with questions about her lodger. A youngish, heavily bearded man, who came to her and offered double her usual rent on the condition that he get the room on his own terms. Another classic adventure from Sherlock Holmes. 
 
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