The 3rd floor

Arturo Ambrose, a junior in high school, feels as though his head is going to explode. I mean ofcourse a big part of it has to do with college applications, grades, sports, family and maybe with the fact that he has no idea if he even likes girls. Felix Blanchett always had a bone to pick when it came to Arturo, turned everything into a competition. And after getting paired together for a project, things shortly get chaotic which earns them a detention. A few years back a boy was brutally murdered on the 3rd floor which now had been closed down since. The school, trying to reopen the floor once more, makes Arturo and Felix help clean 1 of the rooms up there. Something was wrong, felt wrong. It felt like every step Arturo took on that floor was a mistake. It felt as though eyes were on him constantly. That something's eyes were not human. Arturo felt as though he had made eye contact with death himself. What the hell is that thing?