London, 1866. Dr. Barnabus Milligan has always felt called to help people as part of his work with the Dread Penny Society. Three years ago, he helped rescue Gemma Kincaid from her family of notorious grave robbers by secretly marrying her. When Gemma realized her love for her new husband was unrequited, she left. When she returns to help him hunt her family and other notorious London criminals, Gemma and Barnabus realize they might make a better match than either of them suspected.