"Oh, yes," Lydia said. "I'm quite certain that he knew, though he made no effort to enlighten me." After all, if she failed he got to eat her, so for Wormentongue it was win/win!...or so he thought. "Things got very complicated after I found out it was Miss Lambe, of course..." Goodness, she hadn't even explained about Wickham yet! "Well, it all came out all right in the end. Miss Lambe finished her transformation at a rather fortuitous moment, and she bound Wormentongue for two hundred years."

Had she told Adrian when she was from? At any rate he might suspect that the math might not be mathing here.