El c�rculo rojo (t�tulo original: The Adventure of the Red Circle) es uno de los 56 relatos cortos sobre Sherlock Holmes escrito por Arthur Conan Doyle, publicado en 1911. En este relato, } Watson nos sumerge en el laberinto de la acci�n. Los inquilinos del 221-B de Baker Street atienden la visita de la se�ora Warren, due�a de una casa de hu�spedes. Al describir la actitud adoptada por Holmes ante la buena mujer, Watson hace una interesante observaci�n: "Holmes ten�a un lado accesible: el del halago; y para ser justo con �l, otro m�s: el de la bondad". Bar�metro de los sentimientos de Conan Doyle hacia su personaje, Watson descubre con sus observaciones la careta con la que Holmes intenta ocultar su verdadero rostro.
Sir Arthur Ignatius Conan Doyle was a Scottish writer and physician. He created the character Sherlock Holmes in 1887 for A Study in Scarlet, the first of four novels and fifty-six short stories about Holmes and Dr. Watson. The Sherlock Holmes stories are milestones in the field of crime fiction.
Doyle was a prolific writer. In addition to the Holmes stories, his works include fantasy and science fiction stories about Professor Challenger, and humorous stories about the Napoleonic soldier Brigadier Gerard, as well as plays, romances, poetry, non-fiction, and historical novels. One of Doyle's early short stories, "J. Habakuk Jephson's Statement" (1884), helped to popularise the mystery of the brigantine Mary Celeste, found drifting at sea with no crew member aboard.