Kate Warne is the country's first female detective, a Pinkerton agent, and a Union spy. It's August 1861, and her latest assignment could end the Civil War and bring the United States together again. All she must do is win the trust of Confederate spy and socialite Rose Greenhow. But Kate has secrets that make her vulnerable, such as her forbidden love affair with a colleague. Kate faces not only the moral and political divides between herself and Rose but also the ones she's made in her own heart. She must decide which divides are worth crossing and how far she's willing to go to defeat the Confederacy in this spellbinding and moving new novel from Megan Campisi.