I'm not sure I want it to go back to the episodic type now, I'd rather they got this story finished with as her boss Captain Montgomery intended with that envelope (which for some bizarrely didn't reach the intended person months later, when Beckett returned to work).
Actually, if you watch it again, you'll see that this person got the letter pretty much straight after the shooting. You even see him as a doctor, walking past Castle when he's taking flowers to Beckett in the hospital.
It's a few months later when he contacts Castle, but I'm guessing it took that long because he needed to look over the evidence Montgomery sent him and then act on it.
Will be interesting to see who this character is and what his intentions are.
Bonus question, what did that man say on the phone near the beginning when he opened up the files and called Washington? He asked for who/what? I couldn't work it out.
Bonus question, what did that man say on the phone near the beginning when he opened up the files and called Washington? He asked for who/what? I couldn't work it out.