"Spring, 1897. London. Margaret Harkness, now in her early forties, must leave England for her health but lacks the funds. A letter arrives from her old friend Professor Bell, her old comrade in the hunt for Jack the Ripper and the real-life inspiration for Sherlock Homes. Bell invites her to join him in Germany on a mysterious mission for the German government involving the loss of state secrets to Anarchists. The resolution of this commission leads...