From the USA Today Bestselling author of The Magician's Lie"Macallister is becoming a leading voice in strong, female-driven historical fiction. Exciting, frightening, and unspeakably moving..."—Erika Robuck, bestselling author of Hemingways's GirlFor the first daring female Pinkerton detective, respect is hard to come by, but danger and spies are everywhere.In the tumultuous years of the Civil War, the streets of Chicago offer a woman mostly danger and ruin—unless that woman is Kate Warne. As an undercover Pinkerton detective, Kate is able to infiltrate the seedy side of the city in disguises that her fellow spies just can't manage. She's a seductress, an exotic foreign medium, a rich train passenger—all depending on the day and the robber, thief, or murderer she's been assigned to nab.But is it only her detective work that makes her a daring spy and a clever liar? Or is the real disguise the good girl she always thought she was? As the Civil War marches closer, Kate takes on her most