After a hostage situation turns deadly, CSI must scour the scene in order to bring justice to those responsible. However, they soon discover that one of their very own may have closer ties to the suspects than they ever would have thought.

The Internet turns a high school girl into an instant sex symbol around the world, and when information about Horatio is leaked, his life is threatened.

Horatio is in a race against time when his son goes missing following a deadly prison break.

While investigating the death of a student in a car fire, the CSIs come across evidence that suggests Tim Speedle may still be alive.

A sports legend is murdered and the investigation is stalled when the body disappears from the lab.

After several odd occurances, the CSIs must find a serial killer who killed during a total solar eclipse.

When a model dies from electrocution on a runway, the case leads Horatio once again to his son.

When a family vacation takes a turn for the worst, the CSIs are called in to find a killer before those who survived take matters into their own hands.

After Calleigh is targeted, her professional and personal life are at risk.

The CSIs delve into the lives of the rich and famous when a nanny to the wealthy is found dead.

When three weapons' smugglers are killed by a rare and illegal machine gun the CSI team must find the killer and the gun before it kills again.

The investigation of a young woman's murder, reveals a meth lab in her apartment. The team also discovers an unscrupulous FBI agent's secret life.

Kyle's mother, who is also Horatio's ex, reappears as a rich widow, with the intent of taking custody of Kyle.

A murder bride at a wedding finds an unexpected suspect in the groom, a professional baseball player who was standing right next to his bride when she was shot from a distance. The investigators head to the site of the bachelor party, a strip club where one of the strippers was stiffed by a member of the stag party.

Horatio must once again face his past when Julia arrests him and has him extradited to Brazil for a murder two years earlier. Meanwhile, Calleigh's alleged work mistakes are being put on the internet by an unknown cyberstalker.

While Horatio deals with his past following his arrest, the other CSIs must work against the clock to save Calleigh from kidnappers.

When a vigilante killer is on the loose tracking down and murdering Internet predators, the team must act quickly before the vigilante claims another victim.

After a body is found in a sinkhole, the team's investigation into the victim's death leads them to a robbery where the target is keeping a shocking secret.

Alexx must decide between professional duty and family duty when her son becomes a suspect in a murder case. As the investigation goes on, Alexx finds that saving her son may have dire consequences.

When a man dies because of a fake 911 call, Horatio squares off against a private investigator who is one-by-one taking apart his team.

Horatio risks his own life in order to stop someone who is determined to tear apart his team.