Argento; primary colours, Goblin soundtrack, beautiful set pieces, and a paper-thin plot (that doesn't make much sense anyway).
This time, an American student (The impossibly cute and perpetually surprised-looking Jessica Harper) has travels to Europe to join an exclusive Ballet school... Which turns out to be the front for a much more sinister operation.
As this is one of the 'Three Mothers' trilogy you've probably figured out by now that (Mild spoiler) it's witches.
Head witch is the Directoress of the school, who is allegedly away on business, but (bigger, but not huge, spoiler) we soon learn that she is still in the school when (I shit you not) one of the students recognises her snore!
Like I said, the plot is pretty much bobbins, but it has to be forgiven as parts of it are a joy to watch - in particular a scene in which a winged creature attacks someone off-screen - we never see the beast, only glimpses of it's shadow, but it's one of the most effective 'monster' scenes I've seen in a while!
For its visual busty, I'm leap eared to overlook the nonsensical / scarce plot, and give this one a thumbs up - it's no more than I did for Fuluci's "The Beyond".