Sherlock recibe a un joven, John Openshaw, que quiere contratar sus servicios para ayudarle a resolver un caso familiar, que parece tener que ver con una carta en la que venían 5 semillas de naranja y un papel con las letras KKK.
Unos días después de recibir la carta la polocía ha encontrado un hombre muerto en un estanque. Al no haber pruebas de lo contrario el veredicto fue de suicidio cerrándose el caso. Pero Sherlock va a abrirlo de nuevo y desvelar la verdad que no se supo encontrar entonces.
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.