The line between the living and the dead blurs on Halloween.
When Sara unexpectedly returns, the CSI team come together to investigate the death of a famous young actress killed in a dubious traffic collision.
When two office mates plot to rob a casino, their plan ends with the CSIs investigating a murder.
Horatio confronts a private investigator (Tom Sizemore) who is systematically destroying the team.
The CSIs investigate soggy remains after a tractor-trailer full of exclusive party guests ends up at the bottom of the Hudson River.