After a failed investigation by the Aurors, a distraught mother begs the Headmistress of Hogwarts, Minerva McGonagall for her help getting justice for her daughter. Minerva turns to the Head of the Department of Mysteries, the Golden Girl, Hermione Granger, for help and they form a scheme to root out the evil that lurks the corridors of Hogwarts. Ex-Auror Bellatrix Black has no int

Hermione and Ginny work at a library and the horror/crime author Bellatrix Black uses their library for her research. Ginny is convinced Black is not a writer, but a serial killer looking for ideas.