Mrs G is trying to remember the title of a film that is maybe 15-20 years old - I wonder if anyone here can help. The plot is along the lines of:
1. Some people get invited to a mansion by the husband on the pretense of a party for his wife - but he intends to bump them off one by one.
2. The house is locked and as the people look for a way out they find that there are booby-traps etc.
3. The may, or may not, be a supernatural element - she can't remember.
4. The final scene is of two survivors climbing out of an upstairs window to find themselves on a ledge high up on an exterior wall with no way down - then the window shuts behind them!
Or something like that - any ideas anyone?