Archimimus. The Life and Times of Lukitt Bachmann, Paperback/Clio Gray

Lukitt Bachman is waiting in his Lanterne de Mortes, a Tower of the Dead, in the middle of a cemetery. He has become an assassin and a murderer, learned the terrible highs and lows of friendships made and lost, and is awaiting now his last remaining friend to set him free so he can put right past wrongs.