The CSI team investigates a murder case that hits close to home for Folsom. When he is forced to sit this investigation out, he does his own digging with help from Trey. Worried Folsom will do something he regrets if he gets his hands on the killer, the team find themselves racing to arrest the suspect first.

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.

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 bomb that detonated during a masquerade party for wealthy investors at the site of a new casino.

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

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.

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.

As Grissom and Sara close in on who framed Hodges, the CSI team investigates a lock room murder mystery at 30,000 feet, when a cargo plane lands autonomously at McCarran Airport and everyone on board has been killed.

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.

Grissom and Sara's investigation into charges against David Hodges heats up as Internal Affairs joins the hunt. Also, pressure rises for the CSIs when a video game developer's body is found floating in a fountain before a huge gaming tournament.