Cold Case is a drama about Lilly Rush (Kathryn Morris), the lone female detective in the Philadelphia homicide squad who finds her niche when she's assigned to "cold cases"--crimes that have never been solved. Previously, she used her instinctive understanding of the criminal mind on current murders. Now, she's interrogating witnesses whose lives and circumstances have since changed, making use of today's new science and finding fresh clues to solve cases that were previously unsolvable, all of which appeals to this smart, driven detective. She's also prepared for the consequences: that her work will open up old wounds and may lead suspects to commit new crimes. When she hits a dead end, Rush seeks advice from her respected mentor, Lt. John Stillman (John Finn). Also on the team are Det. Scotty Valens (Danny Pino), Rush's confident and strong-willed partner; Det. Will Jeffries (Thom Barry), who's been around long enough to serve as Lilly's link to the past; and Det. Nick Vera (Jeremy Ratchford), a tough cop who's considered the go-to guy for getting a confession. Rush sees her assignment as a turning point in her career when she decides to make it her business to make sure that no victim is ever forgotten.