Amber

“Bridget blinked once. “Books do not have souls, sir.” “Those who write them do,” Ferus said. “They leave bits and pieces behind them when they lay down the words, some scraps and smears of their essential nature.” He sniffed. “Most untidy, really—but assemble enough scraps and one might have something approaching a whole.” “You believe that the library has a soul,” Bridget said carefully. “I do not believe it, young lady,” Ferus said rather stiffly. “I know it.”
― Jim Butcher, The Aeronaut's Windlass