This is one of those rare films where identifying its genre gives away far too much. Nor is it possible to mention which 1960 movie it strongly resembles without giving away the ending. Nor, for the same reason, can we reveal which current obsession of modern genre fiction is the film’s deep dark secret!
Frustrating, indeed. Perhaps this is why it remains somewhat obscure, despite the fact that this is one of the last good films Peter Cushing and Christopher Lee did together. Or perhaps because, after a series of strange murders, it becomes a somewhat dry police thriller for most of its running time, with only a few off key elements to suggest that there may be more going on here than we realize.
What is intriguing is how badly this film has been misrepresented in so many reviews, from those that refer to one character as a serial killer when she is in fact a red herring, or others that classify Nothing But The Night as occult horror, when these elements are yet another red herring.
Ah, well. There is one thing, though, that we can safely say: no one could ever match Peter Cushing when it came to staring intently at a test tube.