Scribbler of Dreams, Paperback/Mary E. Pearson

Kaitlin Malone hates the Crutchfields. Her family has feuded with that family for generations, and now her dad is in jail for killing one of them. This legacy of hatred has never been questioned--until Kaitlin falls for a Crutchfield boy. As if that's not bad enough, that boy is the son of the man her father murdered.