The conclusion of the Sisterhood of Suns series… Occupied by the Sisterhood, the ETR is on the verge of civil war. In the Sisterhood itself, terrorism is on the rise, and a sinister conspiracy at the highest levels of society threatens to overthrow the government and ignite an interstellar war. Peace, and the balance of power in the Far Arm depends on an unlikely group of heroines and a mysterious artifact thousands of years old.