"And also make an Unbreakable Vow," Zabini said, with a grin. "Never to reveal anything about our establishment. And in turn, I’ll vow not to reveal your own secret, Granger. I have to say though, I wouldn’t act quite so superior if I were you. Covering up a murder?" He laughed cruelly. "Sounds like you’re not really above us after all. It’s wonderful when the rules don’t apply to you, isn’t it?"