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Mrs. Warren visits Sherlock.
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Mrs. Warren asks Sherlock to help her with the mystery of a new lodger she has. This person doesn´t want anybody to see him/her. Mrs. Warren is worried and frightened.
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Her lodger doesn´t go out. She has never seen him/her except for the first day. She even doesn´t know if the person who is living in the room is the same as the one who rented it.
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Sherlock and Watson are interested in Mrs. Warren´s problem.