Where previously she had used her instinctive understanding of the criminal mind to crack current murder cases, this smart and driven detective is now intrigued by new challenges -- interrogating witnesses to old crimes whose lives and circumstances have since changed, making use of today's new science and finding fresh clues to cases once thought to be unsolvable. Lilly is also prepared for the consequences -- that her work will open old wounds and may lead suspects to commit new crimes.

When she hits a dead-end, Lilly seeks advice from her respected mentor, Lt. John Stillman (John Finn). Also on the team is Det. Will Jeffries (Thom Barry), who's been around long enough to know where all the bodies are buried and Det. Nick Vera (Jeremy Ratchford), a tough cop who's considered the go-to guy for getting a confession.

Lilly sees her new assignment as a turning point in her career, and she makes it her business to ensure that no victim is ever forgotten