If you enjoy trying to solve the mystery as you read, I recommend you forget about this one. Even the characters don't know who is who. Twists and coincidences are used liberally to keep the plot moving. The dialog has an overly melodramatic soap opera quality throughout. The romantic interests intrude on the story and soon become extremely annoying. The worst Hume book I have read, very disappointing.
Nineteenth century British diplomat suddenly finds himself in an alternate world with many similarities to his own but different history. I have not read much alternate history fiction, but enjoyed this story.