Gene Wolfe: Severian of the Guild [2007] paperback

Severian is a torturer, born to the guild and with an exceptionally promising career ahead of him …until he falls in love with one of his victims, a beautiful young noblewoman. Out of love, Severian helps her commit suicide and escape her fate – no more unforgivable act for a torturer. He is exiled from the guild and his home city to the distant metropolis of Thrax with little more than Terminus Est, a fabled sword, to his name. Along the way he has to learn to survive in a wider world without the guild – a world in which he has already made both allies and enemies. And a strange gem is about to fall into his possession, which will make his enemies pursue him with ever more determination …Welcome to a world in which nothing is quite as it seems; to an unreliable narrator; to extraordinary, vivid and evocative writing; to one of the greatest genre classics of all time.