The drama is very interesting and engaging, but still there's no explanation of why things are happening or what is the cause. It doesn't make any sense at the end. I don't recommend this movie. I thought it was going to be similar to "A Quiet place" from John Krasinski , which makes sense why the characters cannot make any noise. In this movie, However, I didn't get it. I have asked other people and still there are missing pieces.