Salaisuus pinnan alla

Just finished watching this with my wife. I'd seen the trailer and it looked good... and it was, until about halfway through the movie where, in my opinion, it went off the rails with a stupid plot twist. I understood the twist and everything that transpired after, but felt it unnecessary and worse, that the movie would have been better without it, sticking to it's original setup. The whole landscape of the film changes after that twist and not for the better - it feels like it exists just so it can exist, and not for the betterment of the story.