This story is not as far fetched, as it seems. I had a similar experience a few years back and it was really scary. To make things worse, the woman lived next door. She also looked very similar to Greta. It didn't get quite so out of hand though.Yikes.
I "enjoyed" the film despite the similarities. It was edge of seat stuff.
I did wonder about certain parts of the movie and how weak Francis was. That was a bit daft.
The handbag element was pretty original, though. I would recommend.