Dexter has discovered Gellar is dead and, judging by his wounds, Travis killed him. Travis sees that Dexter has figured out his secret and locks him in while he runs outside and has a "conversation" with Gellar.
Dexter is at a loss with what to do with his new captive. He is afraid if he lets her go, she will turn him in to the cops. But he can’t kill her - she is an innocent. A little recon reveals her name: Lumen Pierce, and that she has been in Miami for about a month after a fight with her parents.