Ok, so I really really enjoyed this episode of Castle! It brewed with cute Castle/Beckett moments and I totally did not expect the murder case twist in the end.
I always recall the original show description given to Castle.. A novel mystery writer following an NYC detective (who always seems to be thrown all the odd & outrageous homicide cases) for research. This episode had the suspenseful - though perfectly balanced with lightheartedness - feel (I agree with Det. Ryan, those dolls were creepy!) in the episode, which is what personifies Castle and wonderfully fit its show description.
Don't get me wrong, I'm one of those fans that enjoys all Castle episodes. I am by no means a critic, just a fan. I just really loved this episode. This 'Once Upon a Crime' stayed true to its pun as we reminisce in delight when we all first fell in love with Castle, 'Once Upon a Time' :)