My Substitute is DEFINITELY a Vampire!

Jon knew when he first met Ms. Swift that something was a bit "off" with her. Then it hit him! He had seen her before, and he knows who...or better yet...WHAT she is. His first attempts at proving her real identity were foiled, and he wound up getting into some trouble. He has tried to let it go and get on with his life, but this sinking feeling in the pit of his stomach wouldn't allow him to forget. When he wakes up with bite marks on his neck after a very vivid nightmare, he knows he had to find the evidence he needs to protect himself and the others. He is on a mission to find proof that his substitute was really a vampire!