This does not make for cheery viewing, though there were several moments in the first half of the film when I snorted with laughter.
The premise, of a family's quiet harmony being disturbed when an outsider arrives, is not new, but this slowly drip feeds a dark back story to develop a brooding menace. By the halfway point of the film it is clear there can be no happy ending. It's a well made, well acted piece, but definitely not a first date movie!
The film genre is psychological thriller. But with big problems. The bad guy is flagged up from the beginning and I predicted the outcome within the first 15 minutes. The plot is full of holes and contrived coincidences, and as the film went on (it goes on for about 2 hours), it descended more and more into mawkish melodrama.
The film is exciting with clear cut characters, however I felt re-writing many scenes! As for the ending, I don't think I would spoil the film by saying, there is no ending, the film stops.