There is so much creepy imagery here, from the lady in white calmly walking into the water to our first glimpse of her horrifying face; for once this is not CGI, and is absolutely terrifying. Add the fact that the mysterious lady seeks to catch and sacrifice children and you have dark, fairytale horror that may not be German but is nevertheless reminiscent of the dark, pre-Disney Grimm tales. I note, too, that the weeping woman lives to strike again; this is but a temporary victory.
As well as this we have a lighthearted B plot with Monroe (who really does Halloween) and some trick-or-treating kids. Juliette`s plotline is intriguing, however; she is acting as translator, being part Spanish, and has some interesting chats with the missing boy`s grandmother. She sees Juliette`s scratch and comments, correctly, "You were very sick. You don`t remember it." This will have consequences.
The adversary, for once, is not a Wesen, but this Halloween episode of Grimm is possibly the finest so far.