On the 10th anniversary of 9/11, Mac and the team remember specific moments from that day that were indelibly burned in their mind.

When the body of a beautiful young woman is found in a stolen Ferrari, the investigation leads to a family of car thieves, but the CSIs must find the murderer before the rest of the family meets the same fate.

A night out for a friendly drink takes an unexpected turn when Danny and his rookie cops are caught up in a shooting.

The CSIs investigate when the recently paroled brother of a young basketball prodigy is implicated in a murder.

The CSIs investigate when a fraternity prank goes awry on Halloween and a pledge master is left for dead in an open grave.

When news of a high school house party goes viral, resulting in overcrowding, a collapsed porch and a teenage girl's death, the CSIs must use social media to uncover the truth about how she died. Meanwhile, Jo's final case at the FBI returns to haunt her.

As the CSIs investigate the assassination of a judge, Jo comes face-to-face with a criminal from her past.

When an important witness turns up dead, Jo is caught up in the dangerous investigation of the suspected rapist who was freed on her watch in D.C.

A charred body turns into a hot mess for the CSIs when it appears a cage fighter has been murdered by his stalker.

A home invasion investigation becomes more complicated when the victim's family turns out to be less perfect than they originally seem.

The CSIs investigate when a role-playing game turns lethal, with one player falling victim to a bona fide killer and the other kidnapped and held for ransom.

When the CSIs investigate two seemingly unrelated deaths, their separate trails of evidence lead to a surprisingly connected conclusion.

When a lab tech is murdered in a case that has eerie similarities to a 1950's cold case, the CSIs get a glimpse into what goes on in the shadows of the lab.

Mac og teamet fordyper seg i dataspillkonkurranser da de oppdager at et drap kan ha forgreninger i en turnering der store pengesummer står på spill.

En voldsbølge truer et lite New York-samfunn, og Flack etterforsker en sak der noen har plassert kroppsdeler fra et lik på fire forskjellige gatehjørner.

Mac og teamet prøver å komme til bunns i drapet på en vellykket forretningsmann ved å oppsøke hans tidligere nabolag i Brooklyn.

Sesongavslutning: Mac svever mellom liv og død etter en voldsom skuddveksling, og CSI-teamet må dra den skyldige for retten.