Carlos and Gabrielle get temporary custody of Lily; Bree's father and stepmother (Carol Burnett) come to town to mediate; Susan suddenly finds Karl back in her life.
The parents of a missing college student seek help; David gets help on the Cytron case from an unexpected source; Mellie proves her political prowess.
When Reid fears his mother has been abducted, he asks the BAU to investigate while he's stuck in prison.
Catherine and McGarrett go to Afghanistan to help a young boy, whose family saved Catherine years earlier.
Cooper's drug problem becomes worse; Ben nears the end of his training period.