A passionate lifelong fan of the Sherlock Holmes adventures, Pulitzer Prize-winning critic Michael Dirda is a member of The Baker Street Irregulars--the most famous and romantic of all Sherlockian groups. Combining memoir and appreciation, On Conan Doyle is a highly engaging personal introduction to Holmes's creator, as well as a rare insider's account of the curiously delightful activities and playful scholarship of The Baker Street Irregulars. On...