Once one figures out what is going on in this movie, it actually is interesting. Much more of a psychological thriller than an actual horror movie.

For the most part this is a captivating mood piece, held together by Ricci’s take on a woman who is chasing an impossible idyll while being trailed by something dark and murky.

An exercise in tedium which checks the barest boxes of “completed movie”...

Monstrous loses its way in the second act and doesn’t bother to pick itself up again until the story comes to an end as Siverton chooses to focus on the central characters more than the monster.