Brooke organizes an "End of Summer Beach Party," but soon finds she's the only one in a party mood. Nathan comes home from High Flyers to reconnect with Haley, but he and Lucas are at each other's throats. Meanwhile, Lucas struggles with Brooke's new rules for dating, Peyton tries to come to terms with the new truths about her family, and Dan remembers what happened the night of the fire at his dealership.