"None remain in the library, alas it has been expurgated, cleansed of some of the more interesting texts since my days here as a s-student. The best text on that subject is Secrets of the Darkest Art, by Owle Bullock. I believe it now forms part of the H-headmaster’s private collection, though I advise most strongly against asking him to loan it to you." He wore a rather scornful, sneering look on his face. It looked quite out of place – he usually looked so meek and mild-mannered.