Clary is a girl with no friends at her school. She eats alone in the library. She doesn't talk to anyone. Her ex best friend holds a grudge against her. That all changes when the school's bad boy Jake comes into her life.
Simon gets the shock of his life when he finds out that his girlfriend, Clary cheated on him with Jace. they break up and Jace seeks out Simon to apologize. Jace tells him a secret and they end up being friends.
Simon starts having weird feelings for his new friend and he has no idea how to handle it. And then there's Clary who refuses to take no for an answer from either Jace or Simon.