The Little Girl Who Lives Down the Lane (1976) - I liked this eerie / strange film, but apparently the star (a young Jodie Foster) did not. It's creepy, you'll never be able to think of kindly President Bartlet the same way again, the magician boy is so likable, etc.
(as usual with these posts - spoilers ahead.)
"Living by herself in her father's house, resourceful 13-year-old Rynn Jacobs will do anything to remain independent and to keep anyone from discovering what she's hiding in the cellar."
See all the past movie posts here.