Wadsworth's true identity is different in all three endings. In "ending A", he is what he says he is, that is a real butler who is another one of Mr. Boddy's victims (and he's also a very good amateur sleuth). In "ending B", he is an undercover F.B.I. Agent, and being a butler was his cover, and in "ending C", he is really the despicable Mr. Boddy pretending to be a butler.