Severian, a torturer's apprentice, is exiled from his guild after falling in love with one of his prisoners. Ordered to the distant city of Thrax, armed with his ancient executioner's sword, Terminus Est, Severian must make his way across the perilous, ruined landscape of this far-future Urth. But is his finding of the mystical gem, the Claw of the Conciliator, merely an accident, or does Fate have a grander plans for Severian the torturer...?