How is it true?(jeff the killer book one)

What the hell why you so cranky bitch
I think as my mom screams at me. I get up and just stare at her like whatever and walk to my room to clean it. As i get in my room i get a feeling like im being watched but i brush it off because usually its just my head.(boy was I wrong)

This is about a girl named steph and how she finds out the unimaginable is real.