Lord John and the Hand of Devils by Diana Gabaldon
This is not one novel, but a short story (Lord John and the Hellfire Club) and two novellas (Lord John and the Succubus and Lord John and the Haunted Soldier). I really enjoy Diana Gabaldon's writing (the Outlander series) and Lord John Grey is an interesting minor character from that series. This was an enjoyable read, but not as good as the Outlander series. I rate it 3 out of 5.