"Thrill of the kill" is clearly an underrated episode, and delivers, taking the viewer into the mind of a twisted serial killer and ending with an interesting twist.
The character of Kellerman has been successfully introduced, and is not seen so often in this episode, sadly neither are Bolander and Felton. Pembleton and Bayliss are the focal point once again and this combo is perfect along with the FBI.
I realize this episode has some minor flaws, such as the FBI's role in this investigation, the FBI would normally take a much bigger stranglehold and run the show. Pembleton who's booming voice is perfect for the megaphone in reality wouldn't be the one using it. In the end, despite the minor flaws this episode is well done.