Diamond Knives is a halfbreed of unicorn and zebra, and a resident of the Prison, a correctional facility that was sealed long ago to protect itself from the ravages of the Great War. However, she and her closest friend, a zebra by the name of Zeed, flee in order to escape the most recent riot, when Knives is caught by a rival among the Guards, and nearly killed in the incident. Finding herself given a new life within the ruins of Canturbury, she will soon discover that she is not what she once believed herself to be, and be forced to find the freakish experiments performed within Canturbury Research, in order to stop a madman from destroying whats left of Equestria.