Concluding episodes from the fourth series of the American television detective drama, about the team of forensic specialists who use their clinical skills to solve the most violent crimes. In 'Suckers', a young woman found drained of blood suggests the presence of a group of modern-day vampires. 'Paper or Plastic' sees Officer Fromansky (David Andrews) involved in a grocery store shootout, but Grissom (William Petersen) doesn't believe his version of events. In 'Early Rollout', the team investigate the killing of a club owner and his wife. In 'Getting Off', the body of a professional clown is found stuffed inside a tyre in a dangerous part of town. 'XX' sees the team investigating the murder of a female prison inmate, tied to the underside of a crashed prison bus. In 'Bad to the Bone', Grissom is violently attacked by a suspect, who dies suddenly when subdued. 'Bad Words' sees the team investigating a house fire, where the discovery of a girl's body turns the investigation from arson to murder. 'Dead Ringer' sees the team suspecting several policemen for the murder of a runner in the force's annual Desert Relay Race. In 'Turn of the Screws', a roller coaster accident at a fun fair leaves six people dead, although the team discover that one of the victims was dead before the accident happened. 'No More Bets' sees the CSI team looking into the murder of two college students who were attempting to scam a casino, but Grissom removes Catherine (Marg Helgenberger) from the case because of her personal involvement. Finally, in 'Bloodlines', the CSI team believe they have an open and shut case on the rape of a casino worker, until they realise that the evidence is lying.