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Short story by Arthur Conan Doyle

"The Adventure of the Red Circle" is one of the 56 Sherlock Holmes short stories written by Arthur Conan Doyle. It is included in the anthology His Last Bow.

Mrs. Warren, a landlady, comes to 221B Baker Street with some questions 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 has seen him. After the landlady leaves, Holmes remarks to Dr. Watson that it seems likely that the person in Mrs. Warren's house is not the bearded man who made the arrangements. Holmes suspects that messages are being sent to the lodger. Holmes and Watson go to Mrs. Warren's house and spy on the lodger, who they discover to be a young woman with a dark complexion. That evening, Holmes and Watson are on hand to see the lodger's confederate send messages by a waving candle. Holmes and Watson meet Inspector Gregson and a Pinkerton detective from the United States named Leverton. They are lying in wait for Giuseppe Gorgiano, a vicious killer. Going into the room where the signalling came from, they discover Gorgiano lies on the floor in a pool of blood from having been impaled with a large knife. The lodger is revealed as Emilia Lucca, and her confederate is Gennaro, her husband. She confirms that the Luccas were seeking refuge from the dangerous Giuseppe Gorgiano, who was out to kill Gennaro for betraying the Red Circle, a secret Italian criminal organization that they had both been involved in. Gennaro decided to leave the organization in spite of the threatened consequences. He and his wife fled Italy and went to New York to escape the Red Circle, but Gorgiano tracked Gennaro down. Gregson takes Emilia down to the police station.

"The Adventure of the Red Circle" was first published in the UK in The Strand Magazine in March–April 1911, and in the United States in the US edition of the Strand in April–May 1911. The story was published with three illustrations by H. M. Brock and one by Joseph Simpson in The Strand Magazine, and with the same illustrations in the US edition of the Strand. It was included in the short story collection His Last Bow,

The story was adapted as a short silent film in 1922. It was one of the short films in the Sherlock Holmes film series by Stoll Pictures, and starred Eille Norwood as Sherlock Holmes and Hubert Willis as Dr. Watson. The story was also adapted for the 1994 Granada TV series.

"The Adventure of the Red Circle" was adapted by Edith Meiser as an episode of the American radio series The Adventures of Sherlock Holmes. The episode, which aired on 15 October 1931, featured Richard Gordon as Sherlock Holmes and Leigh Lovell as Dr. Watson. Another production of the story aired in February 1935, with Louis Hector as Holmes and Lovell as Watson. The story was also adapted for the American radio series The New Adventures of Sherlock Holmes. The radio adaptation, starring Basil Rathbone and Nigel Bruce, was titled "Mrs. Warren's Lodger" and aired on 7 December 1941, the day of the Japanese attack on Pearl Harbor. The East Coast broadcast was interrupted by a radio announcement that President Franklin D. Roosevelt would be addressing the nation at noon the following day. The story was adapted for BBC Radio 2 in 1969 by Michael Hardwick, as part of the 1952–1969 radio series starring Carleton Hobbs as Holmes and Norman Shelley as Watson. "The Red Circle" was dramatised for BBC Radio 4 in 1994 by Peter Ling as part of the 1989–1998 radio series starring Clive Merrison as Holmes and Michael Williams as Watson, featuring Joan Sims as Mrs Warren. In 2013, the story was adapted as an episode of The Classic Adventures of Sherlock Holmes, a series on the American radio show Imagination Theatre, with John Patrick Lowrie as Holmes and Lawrence Albert as Watson.