As Russell and his team investigate a series of murders, one of their own confronts peril on a dangerous undercover mission to get close to the killer.

The CSI team investigates the death of a ghost hunter.

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.

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.

When the CSIs find a body near a forest reserve, they discover what might be a serial killer and his bizarre lair.

The CSIs join David Phillips at his high school reunion when he discovers the prom queen's been murdered.

When several prominent poker players lose their lives, the CSI team is called to investigate before more victims surface.

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.

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.

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. Meanwhile, the CSIs investigate the loss of a local wine collector on part one of a two-part crossover with CSI:NY.

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.

The CSIs investigate the demise of a prominent news anchor during a live broadcast.

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 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 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 investigates the death of a reverend who was killed at the grave site of former CSI Warrick Brown.

Things get personal when D.B. Russell is drawn into the investigation of the death of his son's basketball coach.

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.

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 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.

The CSIs arrive at their favorite diner only to discover a gruesome crime scene with eight dead victims and a lot of questions.

Russell's granddaughter was kidnapped in last season's finale cliffhanger and now he leads the CSI team on a hunt to find her.