he narrated the story of confronting vincent , who had confessed , and of vincents investigation of the poster , which had led them to remys cottage : the necromancy and the index they had found there ; he accounted remys capture to uncle quincy , and of vincents subsequent fear that a practicing necromancer would involve himself with the blood tree only to use it as a source of power : how remys indexs records had revealed a plan far more sinister ; which had hastened them to stop the necromancer after his escape from the camp .