Sin, a.k.a. Cynthia, Davies is another character we expect to see more of in the sequels, but her presence in The Demon's Lexicon is important in that it helps establish two things:
- Nick is a hottie; and
- Mae doesn't see herself as being in competition with other girls. She's not threatened by Sin's beauty or talent, which—according to Nick—is the way most females typically respond to Sin.