The St. Clair's were famous in Beacon Hills as the four of them portrayed the perfect family. Katherine "Kirby" St. Clair was the youngest child of Joseph and Alicia and the sister of Lucas. The family lived in harmony with the Hale family after Joseph and Alicia joined their pack in safety for their children. After the fire that tore both families apart killing Kirby's parents, Lucas and Laura took her and Derek and left Beacon Hills. Now years later, Laura and Lucas go missing in Beacon Hills making Kirby and Derek come back to the place where Kirby never wanted to see again. She just didn't think two boys who go searching for dead bodies would help her find the family she lost years ago.