Keep Your Enemies Closer (Divergent fanfic)

Four is Chicago's biggest villain. He's ruthless, intelligent, and mysterious. Everyone wonders who is this criminal really? Well only he knows, Tobias Eaton.
Six is Chicago's superhero, their savior. She seems to get everyone, but Four. As usual nobody knows who her true identity is. Well except for Tris Prior, but that's obvious. She is living a double life.
So what happens if the home schooled Tris decides to go to a real school for her Senior year? What happens if she falls head over heals for a guy who is too good to be true? Well maybe the saying keep your friend close and your enemies closer is true after all.