Facing an existential threat that could bring down the Crime Lab, a brilliant team of forensic investigators must welcome back old friends and deploy new techniques to preserve and serve justice in Sin City.
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.
The CSI team investigates when a body is dug up in the luau pit of a Hawaiian-themed hotel. Also, Internal Affairs begins to question Grissom and Sara's return to the crime lab.
Max puts CSI on lockdown when evidence in a new murder tips Grissom and Sara to a new suspect in the crime lab. Also, Folsom and Allie investigate a series of chilling killings at a dilapidated clown-themed hotel.
An abandoned horse covered in blood leads the CSI team to a halfway house for convicted murderers. Also, Grissom and Sara begin to circle their prime suspect in the David Hodges case.
When the CSIs are called to investigate human remains found in a convention center owner’s bathtub, Sara and Grissom use the case to get close to attorney Anson Wix’s star forensic expert witness, just days before David Hodges’ trial begins
When David Hodges goes missing, the entire CSI team searches for any piece of evidence that can help locate him, clear his name and save the reputation of the entire crime lab.
When three masked assailants invade a home and murder an entire family, including a pregnant woman, the CSIs are called to the scene to investigate. Catherine leads the team through the emotional case, which intensifies her own longing to reconnect with her estranged daughter, Lindsey.
After all the guests attending an upscale fundraising soiree for the science department at a local university fall ill, the CSI team gears up to investigate. Also, Catherine enlists Grace’s roommate to help her find clues after Grace disappears.
When the bodies of two Regency Romantic Festival attendees are discovered, the CSI team uncovers a shocking link between their murders and previous cases.
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.
Catherine’s day off with her granddaughter gets interrupted when a woman wakes up from a four-year coma and remembers details from the night her sister died.
The CSIs investigate the mysterious death of a competitive eating contestant, and Chavez partners with Allie to prove where the mysterious silver ink notes have been coming from.
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 case.
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. Also, Greg Sanders brings his quirky humor as he returns to the crime lab.
When wrongly accused former suspect Gene Farrow enters the Crime Lab covered in blood, wielding a cleaver and looking for Allie Rajan, the CSI team investigates his peculiar story about a macabre party with a fatal ending.
The CSI team investigates a case where an ambitious investigative reporter is found dead at a peanut factory. Also, everyone in the crime lab buzzes over who Max will promote to day shift supervisor.
With their respected colleague Josh Folsom under arrest for the death of Kahn Schefter – the man responsible for killing Folsom’s mother – the CSI team combs through every crumb of forensic evidence to determine his innocence or guilt.
With a new piece of evidence at play, Catherine Willows reopens an investigation from her past that never got solved after a violent attack left her hospitalized. Internal affairs begins questioning Folsom.
The CSI team is called to investigate when the bodies of Frank Sinatra and Joey Bishop impersonators are discovered behind the drywall of a home construction project. Also, Folsom must face the review board about the future of his career.
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.
The CSI team investigates the death of a local antique shop owner who died from an apparent gunshot wound that is missing one important clue - the bullet. Also, Max makes an important breakthrough in the ongoing case with Ocho from the robotics factory.
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