Tobin James, brother to Haley, returns to Tree Hill after being away with his sister on tour. With summer ending and Senior year beginning, he plans to get close with those he once was (Lucas, Nathan, Brooke, Peyton, etc). However, hearts get in the way and new family rivalries arise. One thing leads to another, and even more new faces arrive in Tree Hill. Time passes along, some love dies while others grow... but, afterall, there is only one Tree Hill and that is what matters.
Isabelle's friendship with Brooke is mending, Lucas seems to have moved away and her other two friends have gotten married. Isabelle is trying to make it through the last part of her junior year without any drama.. but this is Tree Hill after all.