What happens 3 years after Allegiant. Told from the perspective of Tobias, (Christina a little), and someone else you'll later meet (or reunite with

Tessa Young is an 18 year old college student with a simple life, excellent grades, and a sweet boyfriend. She always has things planned out ahead of time, until she meets a rude boy named Hardin, with too many tattoos and piercings who shatters her plans.