First published in 1890, The Sign of Four is Sir Arthur Conan Doyle's second book starring legendary detective Sherlock Holmes. The story is complex, involving a secret between four ex-cons from India and a hidden treasure. More complex than the first Holmes novel, The Sign of Four also introduces the detective's drug habit and leaves breadcrumbs for the reader that lead toward the final resolution.

In the debut of literature's most famous sleuth, a dead man is discovered in a bloodstained room in Brixton. The only clues are a wedding ring, a gold watch, a pocket edition of Boccaccio's Decameron, and a word scrawled in blood on the wall.

En este libro las pistas, los malos, la sospecha y la intriga se multiplican, y no solo eso, tambien las conversaciones entre Holmes y Watson cargadas de reflexiones coherentemente delirantes se multiplican, y el pensamiento profundo: Voy a fumar. Este es un problema de tres pipas, asi que le ruego que no me dirija la palabra durante cincuenta minutos, y los disfraces del detective, y los escenarios londinenses... Y no se multiplica, pero aparece, la unica mujer a la que el misogino de Sherlock regala su admiracion. Y todo, porque Las aventuras de Sherlock Holmes reune un grupo de casos nada...

Challenger sends telegrams asking his three companions from The Lost World - Edward Malone, Lord John Roxton, and Professor Summerlee - to join him at his home outside London, and instructs each of them to 'bring oxygen'. On arrival they are ushered into a sealed room, along with Challenger and his wife. In the course of his researches into various phenomena, Challenger has predicted that the Earth is moving into a belt of poisonous ether which, based on its effect on the people of Sumatra earlier in the day, he expects to stifle humanity. Challenger seals them in the room with cylinders of...

Long before Michael Crichton's high-tech dinosaurs roamed the bestseller lists, Sir Arthur Conan Doyle envisioned an isolated land of prehistoric life that exists in the 20th century. When Ed Malone, a hotheaded journalist with an insatiable thirst for adventure, is sent to interview the notorious Professor Challenger, he manages to charm his way onto the great man's expedition. Challenger leads the four-man team to a South American jungle on an isolated plateau, cut off from the rest of the world by vast, perpendicular cliffs. Here, in this lost world, linger strange prehistoric creatures,...

The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four novels and 56 stories starring the fictional detective. The story is set in 1888.The Sign of the Four has a complex plot involving service in East India Company, India, the Indian Rebellion of 1857, a stolen treasure, and a secret pact among four convicts ("the Four" of the title) and two corrupt prison guards. It presents the detective's drug habit and humanizes him in a way that had not been done in the preceding novel, A Study in...

Long before Michael Crichton's high-tech dinosaurs roamed the bestseller lists, Sir Arthur Conan Doyle envisioned an isolated land of prehistoric life that exists in the 20th century. When Ed Malone, a hotheaded journalist with an insatiable thirst for adventure, is sent to interview the notorious Professor Challenger, he manages to charm his way onto the great man's expedition. Challenger leads the four-man team to a South American jungle on an isolated plateau, cut off from the rest of the world by vast, perpendicular cliffs. Here, in this lost world, linger strange prehistoric creatures,...

The Valley of Fear, the last of the four Sherlock Holmes novels, ranks among Sir Arthur Conan Doyle's best work. The mystery begins with a coded warning of imminent danger, drawing the illustrious Sherlock Holmes and the faithful Dr. Watson to a secluded English country home. A trail of bewildering clues--raincoats, dumbbells, a missing wedding ring-leads to sleuthing in the finest Holmesian tradition and the gripping backstory of a cult that terrorized a valley in the American West. Crisp, realistic characterizations and a cracklingly suspenseful narrative make this novel a must-read for all...

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Arthur Conan Doyle was a prolific writer, and his Sherlock Holmes stories, while the best known of his work, were only a fraction of what he wrote. This book is a collection of twelve short stories broken up into two topics; six stories on terror and six on mystery.
Doyle didn't write too many mystery stories that did NOT involve Sherlock Holmes, and these are some of them. As is well-known, Doyle was a fanatic spiritualist, and many of the tales of terror deal with some strange stuff -...

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A Bigger Challenge for Professor Challenger
In this book, the intrepid foursome who encountered pre-historic dinosaurs in "The Lost World" are brought together to face an even bigger challenge...the death of the human race...and all other species on Earth
Challenger sends telegrams asking his three companions from The Lost World - Edward Malone, Lord John Roxton, and Professor Summerlee - to join him at his home outside London, and instructs each of them to 'bring oxygen'....