This is what I thought was going to happen ...
I recorded Deadline last night but I found out this morning I'd only got the 1st 30 minutes due to the golf coverage overrunning.
I watched the 1st 30 minutes & tried to work out what was going to happen in the end.
If Rebecca hadn't been driving the car to the house I thought it would've been a good twist if Rebecca had turned out to either be a ghost, a figment of Alice's imagination or another side to Alice's personality.
My other theory was that Rebecca & Ben were trying to drive Alice mad & that the films of Lucy & David that Alice found weren't the home movies of the previous owners (Lucy & David) but films produced by Rebecca & Ben in their attempt to drive Alice mad. Lucy & David were part of Rebecca & Ben's plot (or unwitting pawns, actors who thought they were part of a movie Rebecca & Ben were filming). I thought these films would increasingly disturb Alice as they would reveal her fractured state of mind & would go missing (Rebecca & Ben could have had access to the house & could plant & remove films while Alice was sleeping?) at the vital times that Alice required evidence of their existence.
Maybe Alice got the impression from watching these films that Lucy was going to kill David or vice versa? Maybe Alice is able to locate one of these possible killers & kill them, thus being put in the frame for murder by Rebecca & ben so they can be together?
I've read elsewhere on this board what actually happened at the end of the film but I feel that some of my theories may have worked better than those in the film. Does anybody agree - or disagree for that matter?