The CSI’s lives are on the line as they close in on the elusive Dr. Jekyll, and more than one member of the team may not live to see his capture, on part two of a two-part 10th season finale of CSI.

A former colleague accuses Langston of being part of the Dr. Jekyll murders.

A mother, believed to be grieving over the loss of her family three years earlier, becomes a suspect in an investigation.

The team investigate the surprising death of a comedian who was about to appear in his first big Las Vegas reunion show.

Brass and Langston investigate the murder of a student at Lindsey (Catherine’s daughter)’s school, Laurent (Michael Kenneth Williams) is a janitor at the school who may have information about a student murder.

When Hodges and Wendy take a group of high school CSI Explorer Scouts on a field trip, they embellish their role in solving cases and take their assignment a little bit too far.

When the CSI team investigates the brutal murder of a family, they trace the killer to the house next door, which might belong to the “Dr. Jekyll” serial killer.

Catherine and Detective Vartann are thrown together in a hotel room for 24 hours as they stake out a duo making drugs in the room next door. Meanwhile, Nick and Langston work a case that involves a fetish which has become big business in Vegas

When a band member of Rascal Flatts is electrocuted by his own guitar during a concert, the CSI team investigates if it was a case of foul play.

The case of two high school students, one dead and one missing, lead the CSIs into the underbelly of streetcar racing and a tangled web of deadly competition.

The CSI investigates the mystifying death of a former pro golfer whose allegiance to the game might have cost him everything. Sources:

Two secretaries on holiday from Arizona attempt to steal a man’s wallet and ATM pin number in a scam, and wind up dead in different locations. Meanwhile, the CSI team also investigates a disturbing medical mystery involving the dumping of human organs in a wildlife refuge…

The CSIs dig to find the truth about how a recent shootout at a gun store might connect to a young woman who may have committed suicide.

The CSIs investigate a murder at a bowling alley after a critical piece of evidence is revealed during a bowling tournament.

The investigation into the human trafficking ring continues, but it’s a race against the clock.

The CSIs discover that two apparently unrelated crimes are actually parts of the same twisted revenge plot.

An entire college football team comes under investigation when their beloved coach is found murdered in his home.

The team investigates the murder of Jason, a troubled computer geek working at a low-level casino support industry job who lures a colleague, Paulie, into a dangerous plan to make a working stiff’s dream come true.

The son of a notorious killer is arrested on suspicion of murder, and the CSI team must overcome their natural prejudices against the boy’s antecedents in order to track the true culprit.

A rising young star is killed in a wreck and her determined stalker claims credit, but the team finds out there’s more to this tragedy than meets the eye.