I Grok Spock wrote:
Unusually for me, I actually called this one as soon as they showed the perp. A few good chuckles in the episode but it seemed overstuffed with guest stars/red herrings which meant nobody got very much screen time. The heavily hyped Jane Seymour seemed particularly short-shrifted.
It took me the whole episode before I realized that the mousy assistant was played by same actress who plays the werewolf's sister on BEING HUMAN. I knew I'd seen her somewhere before . . .
Fun to see Castle and Beckett discussing "shippers" and such.
But, of course, the best bit came at the very beginning:
"Who would want to kill a writer?"
"Oh, so many reasons . . . ."