Not one of his pets. If Evandau was corrupt from the beginning, he wouldn't have any reason to confide in anyone except perhaps the previous Emperor - and we can't exactly ask her. If he was corrupted recently by our dark overlord himself, he has even less reason to tell anyone anything. If we want answers, we'll have to go straight to him.

[Skulduggery's spoken to Evandau only two or three times before, and found him to be cold but efficient each time. He certainly didn't think there was anything more to it than that. His mistake, really.]