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.
When a Marine is murdered at a charitable event, an irritable war veteran must help solve the crime; McGee and Bishop investigate an intriguing rumor about Quinn and Torres.
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.
Cooper's drug problem becomes worse; Ben nears the end of his training period.