The movie starts with a bird's-view of a mountainous landscape. A car drives down a road. We know our heroine is going to be alone in this journey.
Alice is a private detective set to investigate the events that lead to the death of the son of her client. Her client does not agree with the final report: suicide. She decides to enter sanatorium where her client's son was institutionalized to conduct her investigations on the source. Once there, who can judge sanity over insanity?
The plot follow two storylines: we see Alice's perspective and investigation, and then we shift into a breakout event that led to the death of one of the sanatorium's patients. The story keeps us hooked until the very end, a great who-and-whydunit story that leaves us guessing until the very end.
The ending is good too, although people who read the book where screenwriters based this movie's story on can argue which ending is the best. I personally think both takes are good.
For a mystery story, it's possible to defend that the movie is too long, dragging a bit. I feel that this is not true; the movie is long, but the story is good. I don't mind being hooked for over 2 hours if the story is good.
At the end, I felt rewarded: the movie delivered. One could debate that there are some really messed up stuff that happens, and that the police seems a bit lost in this whole mess, but you need to remember this story happens in 1979.
If you are a fan of mystery dramas and don't mind the time spent on this movie, God's Crooked Lines is recommendable.