The finale has to be pretty damn amazing to top last year's. I'm not sure how they could even get more shocking.
(SPOILER) Lumen was never raped, her twin sister was and she's been following and watching Dexter for a lot longer than this season and has been using him to entire time. Chase kidnaps Cody, Debra catches Dexter confronting Chase and puts it all together; shoots Chase and keeps Dexters secret.