It is 1887, and Alma Rosales is on the hunt for stolen opium. Trained in espionage by the Pinkerton Detective Agency—but dismissed for bad behavior and a penchant for going undercover as a man—Alma now works for Delphine Beaumond, the seductive mastermind of a West Coast smuggling ring. Disguised as Jack Camp, Alma is asked to infiltrate a dockworkers' organization to recover the important shipment, while sending coded dispatches to the Pinkerton agents to keep them from closing in. But in this tense, erotic thriller, it's getting hard for Alma to keep her cover stories straight; one wrong move and she could be unmasked as a woman, a traitor, or a spy.