The Hate Mail at Archfield Academy

The anonymous hate mail was left in the music department at Archfield Academy. Principal Gray remembers that she got some hate mail left on her desk. So who was it? One of the teachers. Annette, you deserve death. You're a disgusting pig. You should leave and die. Ooh, strong words there. Can I see some notes written by some of the other music teachers at this school? He sends his assistant to retrieve documents written by other music teachers  that have typewriters. Who are you most suspicious of? Right, what the hell is going on here,. folks? Are you following this? Yes? Okay, so Gray is gutted. He's like