In 1862, after a tragedy at home, twenty-two-year-old Sylvie Swift parts ways with her twin brother to trace the origins of an enigmatic playscript that’s landed on their doorstep. This text leads her to Nashville, an occupied city bustling with soldiers, saboteurs, partisans, powerful men–and powerful women. Sylvie translates the playscript by day, but at night, drawn into the work by the chief of the Union Army’s Secret Service, she acts as a spy. Both endeavors acquaint her with a sisterhood whose members-including Hannah, a fiery revolutionary to whom Sylvie is increasingly drawn-possess potentially monstrous powers. Sylvie soon becomes entangled in the Cult of Chaos, a feminist society steadfast in its ancient mission to eradicate the violence of men.