Les lignes courbes de Dieu

As other reviewers have indicated this one has a lot of similarities with "Shutter Island", but in contrary to that great movie this one from my point of view crosses the line between creating a meaningful storyline and just creating "smoke and mirrors". For me it's clear that the director has spent more efforts on holding the audience in a constant uncertainty about "what is real and what is imagination" rather than delivering an exciting plot. 3/4 into the movies I realized that I had really no clue what was going on and, even worse, that I didn't really care either! As many other reviewers are mentioning the book it's build on I might consider reading that one.....I might also consider (if I have a day with nothing better to do!) to watch the movie again....just to check that I didn't miss out on anything?