Scream of Fear (1961)

In the beginning, this is just another incapacitated woman being terrorized film. As a member of that genre, it’s an acceptable entry. Susan Strasberg is a wheelchair-bound woman who is summoned to her father’s home only to be told he’s gone despite there being sightings of him on the estate. It’s a spooky setting where there are questionable motives and potential villains amongst the home’s denizens. But, the third act then turns everything on its head and it becomes an unexpectedly different but complementary tale. I personally was taken by surprise and that doesn’t happen often for me with films.