As Quinn distracts Jamie, Haley searches for Nathan. Clay finally gets answers about his condition. Meanwhile, Julian attempts to get back to a normal life, while Brooke tries to give Tara a chance.

Dan enlists Julian to help in his search for Nathan. Mouth fills Clay in about Nathan, as Haley explains Nathan’s disappearance to Jamie. Brooke gets an idea of how to bring patrons to an empty Karen’s Café, and Chris Keller confronts Chase about Tara.

Haley receives news of a possible tragedy. Dan’s search for Nathan leads him back to his dark past. Clay has a breakthrough in his treatment. Brooke and Julian deal with Xavier. Chase’s concern for Chuck pushes him to his limits.

Brooke and Julian take new measures to protect their family. Skills helps Mouth get to a turning point, and Chase faces consequences for defending Chuck. Clay reaches a new understanding with Logan.

The search for Nathan becomes increasingly dangerous, and Dan’s life hangs in the balance. Brooke is surprised when her father returns. And Clay and Quinn reconnect with Logan.

As Haley prepares to emcee the annual Tree Hill Burning Boat Festival, Brooke uses the opportunity to process her father’s betrayal, while Julian tries to breathe new life into a past idea. Mouth and Millie make a change to their morning show, and Clay and Quinn get ready for Logan’s first night at the beach house.

In the final chapter of One Tree Hill, the tenth anniversary of Tric brings old faces and new possibilities for the Tree Hill family.