"The Adventure of the Red Circle" is one of the 56 Sherlock Holmes short stories composed by British author Arthur Conan Doyle. It is included in the anthology His Last Bow.
Mrs. Warren, a landlady, comes to 221B Baker Street with some concerns about her lodger. A youngish, heavily bearded man, who spoke good but accented English came to her and offered double her usual rent on the condition that he get the room on his own terms. He went out the first night that he was there, and came back after midnight when the rest of the household had gone to bed. Since then, neither Mrs. Warren, her husband, nor their servant girl have seen him. The lodger insisted on having the Daily Gazette every morning, and sometimes requested other things. All requests were printed on a slip of paper left on a chair outside the room where meals were also left.
This edition has been formatted for your reader, with an active table of contents.  It has also been annotated, with additional information about The Lost World and also Arthur Conan Doyle, including an overview, plot, adaptations, important points, information about Sherlock Holmes, biographical and bibliographical information.