The ending is probably the stupidest thing I have ever seen and this kind of payoff came after watching a grueling long and very tedious movie.
The characters were awful, with the exception of the male lead, who is a doctor writing a book about chemicals polluting the drinking water, but that is a detail relegated to perhaps three minutes of the film, none the less the actor plays the role well and is the single good actor in the whole mess.
The character of the wife is a shrewish and nagging hag, who is mentally disturbed by the death of their daughter some 30 years beforehand. Even before the storyline begins to unfold, she is pestering the husband about very unimportant details of everyday life!
The two other actors deliver emotionless portrayals, BUT you will find out why as the story progresses.
The ending is NOT worth the long and boring experience of watching this crap!