An explosion inside a casino brings Catherine Willows back to Las Vegas to investigate. And when the crime is tied to Lady Heather, Gil Grissom is brought back as well to aid the investigation. This is a 2 part TV Special. Series Finale

When her idolized twin sister Audrey dies in a car accident, Laurel decides to take her place. But, as she eases into the life she has always wanted, she must decide between continuing the lie or revealing herself.