Upon seeing the title, I was expecting, and hoping, this to be a movie like 'Hider in the House', instead, there is very little intrusion occurring. School kids get violently and graphically killed in different ways by an unknown student, until that student is killed at the end. It did make me wonder and guess for a while who the murderer was, but not too much surprises. There is that element of boring 'wokeness' that every second movie seems to be pushing for these days. The scenes with the cliched American high school/college shtick wears thin for me too. If you are more of a fan of the slasher genre than me, you may get more from it.