When the body of a young girl who was killed over 40 years ago is discovered at the bottom of Lake Mead, Max Roby promises her mother, Raquel Williams, that the CSI team will finally find justice for her daughter.
The CSI team investigates when a nervous system is found hanging above a local car dealership. Also, Chavez and Max search for a missing source in their ongoing investigation of the robotics factory.
When David Hodges goes missing, the CSI team searches for any piece of evidence that can help locate him, clear his name, and save the reputation of the lab.
The CSI team investigates the eccentric world of sideshows when a couple of performers are discovered burnt in a pit. Hodges mulls a plea deal as as his criminal trial kicks off.
When a young, non-verbal boy is found hiding in a stranger's garage, the CSI team searches for his missing mother. Also, Max receives a strange letter with symbols in silver ink that Folsom and Allie recognize from prior crime scenes.
As the CSI team investigates the death of a man visiting Las Vegas for a health and wellness convention, a fiery explosion traps Allie Rajan in the basement of an abandoned hospital.
When the team is called to investigate human remains found in a convention center owners bathtub, Sara and Grissom use the case to get close to Anson Wix's star forensic consultant.
A silver ink note threatening Maxine Roby's life is found at the crime lab, sending the entire CSI team to crack who is behind the notes and how they connect to other murder cases.
Gil Grissom and Sara Sidle come to the aid of a former colleague who is implicated in tampering with evidence. Maxine and the rest of the CSI team work the murder of a couple slain on their wedding day, following the evidence to the salacious underbelly of the Las Vegas elite.