This fanfiction is an AU: Alternate Universe. It was written in the year following Goblet of Fire and does not incorporate material from OOTP, HBP or JK Rowling’s fansite, all of which post-date it. It posits a universe in which Sirius is still alive, and so is Dumbledore; Fudge remains Minister of Magic, Luna Lovegood does not exist, Blaise Zabini is a girl, Ginny’s full name is Virginia, and so on.
