Nightingale's first instinct is to protest, suffused with a quiet sort of shame at being so perceived, but then the question hits him, forcing the breath out of his lungs. "I had a second apprentice," he admits. "A colleague of Peter's, the one who went along with his initial investigation. Lesley was... horribly injured in the line of duty, unable to continue working with the police. Peter had demonstrated the process of lux for her - completely without permission, of course - and she turned out to be an incredibly swift learner. Just before I came here, we discovered that she had betrayed us, allying herself with a dangerous dark practitioner."