The hero/ine finds him/herself the target of a witch cult conspiracy, and everyone including those he/she thought he/she could trust is one of them. The trope namer is "Rosemary's Baby." The following is a list of live action films:
- Bay Coven
- Black Candles
- The Devil's Rain
- Paranormal Activity 3 (This is the only part I've seen, so I don't know if the whole franchise uses this trope.)
- Rosemary's Baby
- The Wicker Man: Technically, they're Druids, not witches per se, but they're still part of a pagan cult conspiracy.
- K-9 and Company