A severed head is found in the middle of a bowling tournament and the CSI team is called in to find the missing body. The murder is tracked to the jealous girlfriend of the victim and his biggest bowling opponent. The episode opens with a bowling championship, where the top two bowlers in the league are battling it out. As one of the champions gets up to have his turn, he reaches down to pick up his ball and a severed head of a man comes rolling up. The CSI's are initially led to believes that his opponent is the murderer, but soon find out that his girlfriends, who seemed quite innocent the whole time, was the one who cut his head off after he was killed by his opponent. She put it in the bowling ball return to seek revenge on the man who murdered her boyfriend.