From the Edgar(R)-nominated author of Hammett Unwritten and Woman with a Blue Pencil comes a startling meta-fiction tale told in the voice of Sherlock Holmes. Set in 1920s' London, Cambridge, and Paris, Holmes's final adventure leads him through labyrinths of crime and espionage in a mortally dangerous inquiry into the unseen nature of existence itself. Sherlock Holmes, now in his seventies, retired from investigations and peaceably disguised as a...