Join Sherlock Holmes as he investigates a quietly curious tenant who only communicates with his landlady through a series of notes in broken English. Mrs. Warren comes to 221B Baker Street to ask for Sherlock Holmes' help after a new tenant moves into her rooms. The gentle landlady is concerned that her tenant isn't all he first appeared to be. After requesting to pay double the current rent on the condition of getting the room on his own terms, the tenant hasn't been seen. He leaves requests in notes on a chair outside his door, and this is also where he collects his meals, but Mrs. Warren is concerned that something darker lurks behind these curious circumstances. First published in 1911, 'The Adventure of the Red Circle' is a thrilling and suspenseful story, not to be missed by fans of detective fiction. This edition features a specially commissioned introduction alongside an article by Arthur Conan Doyle.