AllMovie

CSI launches its fourth season with a two-part story involving a serial killer, a murder trial, a possible coverup, and profound personal crises. In part one, a woman is found in a casino hotel room, her throat cut. Her husband is later found dead in this car. Then another couple, with whom the first victims had been acquainted, turn up murdered. As the CSI team investigates, Nick (George Eads) makes a professional blunder that may allow the perpetrator -- or perpetrators -- to go free. On top of all this, a Vegas judge (John Doman) seems strangely reluctant to issue warrants for the likeliest suspects. And the murder trial of Sam Braun (Scott Wilson), biological father of CSI member Catherine Willows (Marg Helgenberger), drags on.