Former housemaid Rose Gallagher always dreamed of finding adventure, so her new life as a Pinkerton agent ought to be everything she ever wanted. But her old friends aren't sure about her, and even her dashing fellow agent Thomas Wiltshire seems to be having second thoughts. When a chilling new case arrives on Rose's doorstep, she jumps at the chance to prove herself. Six political delegates have been murdered, and the next target is a candidate for New York City mayor, one Theodore Roosevelt. In this follow-up to Murder on Millionaires' Row, Rose gets a chance to prove herself, but this seemingly supernatural killer will stay a step ahead of her as she and Thomas follow the trail through brownstones, ballrooms, and Bowery saloons.