Betsy returns from Hell to a world that is totally different from that which she left, all because she messed with history. 
 Antonia's dead, but Garrett is not. And Mark appears as his scary vampire future self and his normal everyday self because there is two of them. 
 Betsy takes on the Devil and works with a deceptive Garrett to save Antonia and all the while we know she's going to turn her husband into a book at some point. 
 So my issues is can this possibly get more conviluted. I'm not sure I can take anymore of Betsy.