One of my favorite parts about writing What the Duke Desires was all the research I got to do into the life of Eugène François Vidocq, who appears as a character in the novel. What a fascinating fellow! Widely regarded as father of the private detective agency, he was a brilliant man who completely changed how crimes were investigated. He really did invent tamper-proof paper for banks as well as using ballistics for the first time to solve a crime. You can check out more pics of him on my Pinterest page.