The CSI's investigate when a college freshman plunges to her death and her death is revealed to be a murder. They discover the victim had a relationship with Marlon West, a teen who was acquitted on a murder charge with the help of his younger sister, a child prodigy named Hannah. Sara handles the case and she becomes convinced Hannah killed Marlon's girlfriend and is framing him for the murder as an attempt to put him in jail and keep control of him. The whole affair ends in tragedy, with Marlon hanging himself in his cell and Hannah crushed by the news, seemingly showing that she did indeed kill the freshman. Sara burns out at the end and leaves Las Vegas.