Overview
Nathan and Haley find out they're going to have a baby. Lucas starts writing a novel while also questioning what really happened on the day of the school shooting. Nathan gets involved with some shady characters after him and Haley start having money problems. Peyton finds out she has a brother, but he may not be who he says he is. Brooke becomes friends with Rachel and starts a relationship with newcomer Chase. Dan tries to get close to Karen and help her with Keith's baby.
Read more about this topic: One Tree Hill (season 4)