The Ghosts of Baker Street

Must. have. this. book. From Monsters and Critics:

Finally, a collection of new Sherlock Holmes pastiches based on a promising idea: conflicts between the great detective`s super-rational nature and hints of the supernatural. Conan Doyle was a great believer in spiritualism, especially as his life drew to a close. Yet despite numerous red herrings, he never allowed any supernatural incidents or explanations into the Holmes canon. Greenberg and Co. (Murder in Baker Street, 2001, etc.) have enlisted ten contributors eager to make up this deficit, either by providing Holmes with an apparently ghostly apparition that turns out to have a rational explanation (Jon L. Breen, Gillian Linscott, Carolyn Wheat, H. Paul Jeffers, Colin Bruce) or by posing a problem with alternative explanations, natural and supernatural (Loren D. Estleman, Paula Cohen, Bill Crider, co-editor Stashower).