Every crime scene tells a story. But it's not always the obvious one, and teasing out the final proof from the evidence left behind is a formidable and fascinating task. For veteran forensic investigator Gil Grisson and his team, no crime scene is straightforward and no case is ever cut and dried. Using all their scientific skills, with the very latest in cutting-edge technology -- plus a healthy dose of instinct, experience and good old-fashioned intuition -- they leave no stone unturned in unravelling the truth. When a man is found bound, gagged and strangled in his own home, Las Vegas Police Captain Jim Brass recognises the MO as that of a serial killer from fifteen years ago who was never caught. But with plenty of other suspects and motives to go around, it will take all of the CSI team's combined abilities to finally lay the ghosts of the past to rest.