What an episode! Everything goes down. I've been impressed. For so long Castle has stayed inside the box (Murder, Red Herring, Red Herring, Killer, solved) Granted, it was always so funny and enjoyable how they got from the beginning of an episode to the end, that it was worth the trip. But when they go outside the box, they DO NOT fool around! And those episodes are fantastic. I hope they learn from this that it's very O.K. to go outside the box more often.
The worst thing is now I've got to wait till next season for this to resolve. FOUL! That is completely unfair. I'm calling my congressman.