The students love Mr. Johnston, a substitute teacher who takes his job seriously. When he asks Jennie to be his assistant, readers learn that Mr. Johnston is not who he pretends to be. He has an unnatural interest in Jennie. Having no one to talk to about this relationship that excites her, she records her feelings in her diary. Not wanting to divulge any details, I encourage you to read this novel. Remember, if you see something, say something.