If you loved Twins of Evil, try The Watcher in the Woods
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by John Hough, and they both carry the dread mood tag, and they sit in Horror territory. If that's the register that drew you to Twins of Evil, the second film will land in a comparable space — through a different lens.
dread
What The Watcher in the Woods is
Welsh woods. August. A shattered mirror. Strange lights flicker as Jan and Ellie become caught in a decades-old disappearance. Mrs. Aylwood knows more than she lets on. Disney does gothic horror, surprisingly well.

