D.B. Russell leads the CSI team on a hunt to find his kidnapped granddaughter.
The CSIs arrive at their favorite diner only to discover a gruesome crime scene with eight dead victims and a lot of questions.
When a girl is shot and killed at a large rave in the desert, the CSI team has to search for clues, find her missing friend and bring the killer to justice.
When a famed music historian is murdered and left in a piano, it has an emotional effect on Sanders, who had a past with her.
When a K-9 is blamed for the death of his partner, the CSI team discovers there's more to the case. Meanwhile, Finlay and Morgan investigate the death of a high-profile divorce lawyer with a lot of enemies.
Things get personal when D.B. Russell is drawn into the investigation of the death of his son's basketball coach.
The CSI team investigates the death of a reverend who was killed at the grave site of former CSI Warrick Brown.
When eight bodies are found in what appears to be a meteor site in the middle of the desert, CSI Finlay recognizes one of the casualties, prompting her to revisit her past.
The CSI team lends a hand to local law enforcement on the strip with several arrests until a John Doe is found in car. Also, things become personal for Captain Brass when he discovers some facts about his daughter.
When five people are killed in a small plane crash a mile off the Vegas strip, the CSI team is called to investigate. Also, Sara feels the strain of having a long-distance relationship with Grissom when a former lover of hers is involved with the crash investigation.
The CSIs investigate the demise of a prominent news anchor during a live broadcast.
The CSIs need to ace the case involving a rising tennis star. Meanwhile, the CSIs are surprised to hear Hodges is engaged to an Italian bombshell.
When CSI Mac Taylor decides to surprise his girlfriend in Vegas, he discovers she’s missing and asks his friend D.B. Russell for help. The crossover concludes on CSI: New York S09E15 Seth and Apep (II).
The CSIs investigate the demise of a famous Cuban singer’s sister who’s in town as part of a U.S. tour. Meanwhile, Hodges begins to get cold feet at the prospect of marrying his Italian bombshell girlfriend.
Sara is a lead suspect in an investigation after a brief encounter with another man in which she was the last person to see him alive. Also, her separation from Grissom begins to take a toll.
When several prominent poker players lose their lives, the CSI team is called to investigate before more victims surface.
At his wife's urging, David reluctantly attends his high school reunion -- which becomes a crime scene when the bitchy former high school queen is found dead in a back room.
When the CSIs find a body near a forest reserve, they discover what might be a serial killer and his bizarre lair.
When the CSIs investigate a triple homicide, Russell has to find a way to connect with a 6-year-old girl who was the sole survivor and witness.
The CSI team investigates a popular spiritual retreat when a body is found floating in a mud bath. Meanwhile, Hodges questions his marriage plans to Elisabetta.
The CSIs investigate the mysterious death of a ghost hunter and experiences déjà vu when the victim has eerie similarities to an old case.
The crime lab searches for a serial killer inspired by Dante's Inferno, and Brass's daughter may be one of the killer's next victims.
Watch CSI: Crime Scene Investigation Season 13, Episode 21: Ghosts of the Past online on FlixGems. The CSIs investigate the mysterious death of a ghost hunter and experiences déjà vu when the victim has eerie similarities to an old case.