Inmediatamente después de El carbunclo azul, Conan Doyle escribió otro relato de Sherlock Holmes titulado The Adventure of the Speckled Band (La banda de lunares). Posteriormente, Doyle reveló que creía que ésta era la mejor historia de Holmes. Doyle escribió y produjo una obra de teatro basada en la historia. Fue estrenada en el Teatro Adelphi, en Londres, en junio de 1910. En esta ocasión, Watson nos traslada a su época de soltero, cuando compartía con Sherlock Holmes las habitaciones del 221-B de Baker Street, después de su primera aventura, Estudio en escarlata, y antes de El signo de los cuatro. Una mañana de abril de 1883, Holmes y Watson reciben la visita de Helen Stoner, una atemorizada joven que les cuenta una tragedia. Su hermana ha muerto en extrañas circunstancias y aunque la prudencia le impide acusar abiertamente a su padrastro, el doctor Roylott, da a entender que esto es lo que cree, y añade que teme seriamente por su vida. Holmes' client is Helen Stoner, a 32-year-old spinster who lives with her stepfather: Dr. Grimesby Roylott of Stoke Moran. Dr Roylott is the last survivor of what was a wealthy but dissolute and violent tempered aristocratic Anglo-Saxon family of Surrey. After returning from India where he had a large medical practice and had served a jail sentence for killing his native Butler in a fit of rage, Roylott-a widower-settles with his two stepdaughters in the broken-down ancestral manor-all that is left of estates that had extended into Berkshire and Hampshire. The doctor becomes notorious for terrorizing the local village because of his quarrelsome personality and violent temper. Dr. Roylott has required Miss Stoner, who is engaged to be married, to move into a particular bedroom of his heavily mortgaged ancestral home in Stoke Moran. This room was the one in which two years before, Helen's twin sister Julia had died under mysterious and dramatic circumstances-uttering the last words "The band! The speckled band!"-just prior to her wedding. Helen is reluctant to sleep in the room because a number of things about the bedroom are mysterious and disturbing. Late at night, Helen hears low whistling sounds followed by a metallic clang.

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