I love this show. It is like chocolate: no nutritional value whatsoever, but a guilty pleasure I cannot deny myself now and then. And, digested over an extended period of time, not only instantly happiness-producing, but quite addictive as well.
Usually, I am quite happy with the plot development, since it never is or has been the series' main focus anyway (I would wager a great sum of money that the majority of viewers, at least the female ones, are much more interested in two subplots: 1-when will we learn who killed Kate Beckett's mother?; 2-will Beckett and Castle ever admit to-and act on-their mutual attraction?).
But this episode is so stupid, I cannot even enjoy the "candy factor" properly. Come on! Who really did not see that one coming?! I won't tell, but I would not need to, because apart from the writers, who clearly and criminally underestimate the intellectual capacities of the viewers, everybody will have figured it out from the very first mentioning of the very first clue. It is a formula that has been done before a thousand times, and has been done much better.
I am disappointed. But the interaction between Castle and his daughter is sweet, so that, in a way, saves this episode for me. Nonetheless, I hope the writers will do better next time. No pleasure in eating last year's chocolate easter bunny.