Cold Case is a drama based around Lilly Rush the only woman detective in the Philadelphia Homicide Division. One day she is approached by the witness to a crime that happened thirty years ago. She is driven to solve the case and when asked if she'd like to be put back in regular rotation. She states she'd rather continue working "cold ones", the term used by the detectives for unsolved cases. Lilly along with the rest of the squad strive to give victims and their families justice after years of it being denied.