Grissom and Sidle investigate the death of someone who was buried in a shallow grave in a park and covered in lye. The autopsy reveals that the victim was struck by a car in the last 72 hours and bled to death. There was no blood at the grave site, however. The accident is traced to a young lawyer who has just started as an associate with a major law firm. Stokes looks into the death of Stacy Warner who is found in the middle of the desert but is determined to have drowned. She was a an extreme sports enthusiast out on a challenging trek but she seemed ill-prepared for the route she took.

When a Hummer in the wrong way runs over an old Fiero, Grissom meets Capt. Brass to investigate the scene. He learns that the Hummer's driver has fled and the Fiero's driver is alive in the hospital. At a car convention, when the host Mr. Daluca opens the curtains to show the latest RV model to the audience, there is a dead woman. Warrick and Det. Louis Vartann learn that the victim is the twenty-nine-year-old model Lisa Schumacher. Dr. Robbins tells Catherine that Lisa was asphyxiated and she had sex before her death. Daluca becomes their prime suspect. Meanwhile, the model Gwen that is working at the convention, goes to the house of her personal trainer Paul Charles to workout and sees him dead through the window. Greg and Sara investigate the crime scene while Dr. Robbins carries out the autopsy. When he sees a black substance in his eye, Hazmat takes Sara and Greg to the decontamination shower. When the body of a boy is found on a bus stop bench covered by a blanket in front of a laundromat, Nick investigates the case. Dr. Robbins tells Nick that the cause of death was asphyxia from heat damage. They identify the victim is Chase Ryan and Nick tries to understand what might have happened to the boy.