LONDON - Sherlock Holmes enthusiasts got a rare glimpse into the private world of Sir Arthur Conan Doyle as thousands of personal papers - from his passport to his jotted-down story ideas - went on display today. At the same time, the archive has become entwined in a mystery worthy of Doyle's celebrated fictional detective: the bizarre death of a leading Holmes scholar. The papers are to be auctioned off Wednesday, perhaps to disappear again into the obscurity of private ownership, a fate that had obsessed Richard Lancelyn Green, a former chairman of the Sherlock Holmes Society of London. Green,...