Dexter has a hard decision to make.  He must decide if he is going to help his sister get promoted to detective by helping her catch the Ice Truck Killer, or if he is going to find out who he is for himself, and why they are so connected.  To make matters worse, Dexter must do this while under constant surveillance from Sargent Doakes.  Sgt. Doakes never liked Dexter, and he has always been very open about it.  One time he even told Dexter that he never “even walk[s] like a normal person” and that he “glide[s] like a f****** lizard on ice” (Lindsay.)  Dexter seems to find it funny that Doakes is the only one who knows Dexter “isn’t human.”  I think That Doakes is eventually going to find out who Dexter really is, but Dexter is going to get to him first, and he will have to decide what he is going to do with him.