A detective's last day in homicide finds her investigating the disappearance of a 17-year-old girl who was supposed to be spending the weekend with a friend from school in the opener of this crime-drama series. When the teen's parents learn she didn't show up for class on Monday, they launch their own search, and when word gets out about the missing girl, a mayoral candidate cancels a forum planned at the high school.

Police try to determine the connection between the teen girl's murder and the grisly crime scene at "The Cage" in the basement of the high school.