The Collected Mysteries of Sherlock Holmes is a collection of seven complete books featuring the world's greatest detective. Included are; A Study in ScarletThe Sign of the FourThe Adventures of Sherlock HolmesMemoirs of Sherlock HolmesThe Hound of the BaskervillesThe Return of Sherlock HolmesThe Valley of Fear Sir Arthur Ignatius Conan Doyle was a Scottish physician and writer, best known for his Sherlock Holmes detective stories and for the adventures of Professor Challenger. He was a prolific writer whose works include science fiction stories, plays, romances, poetry, non-fiction and historical novels.