A serial killer taunts the CSIs by leaving them cryptic hints, and the longer it takes them to decode these puzzles, the higher the death toll rises, on the eighth season finale of CSI: MIAMI.

As the first new medical examiner they have is shot, the CSIs learn the streets of Miami got more dangerous. Horatio must keep his team alive and restore order to his son's life. The clock runs out when one of their own is gunned down.

When Horatio's ex-girlfriend is killed in an explosion, the team looks within their own department to find the killer.

The CSI's must catch a madman causing havoc all over Miami and the team has to mourn one of their own.

In the first of a two part episode, Horatio once again has to tangle with his ex, Julia, who has it out for him. Someone is out for Calleigh, and is compromising their investigation in the process.

In the second part of the two part episodes, Horatio deals with his past and the rest of the team works to rescue Calleigh from kidnappers.

Calleigh and Ryan come close to being murdered while investigating a home in which they find the corpse of a doctor who's been performing illegal transplant operations in his garage...

Delko is found comatose, and we are taken back to the year 1997 to when the team first formed.

Every member of CSI is a suspect when one of the team's enemies is murdered. When the investigation becomes deadly, Samantha Owens ends up having to be rescued.

When a man is killed due to a fake 911 call, Horatio must face off with a private investigator who is systematically destroying the team. The PI also digs into the team's personal lives and gets both Calleigh and Eric pulled off the case.

When a teenage girl returns home from a big party night at an underage nightclub to find her parents murdered, the search for the killer leads Horatio to New York City. Before he arrives, the New York detectives, led by Detective Mac Taylor, are called out to investigate the shooting of an undercover police officer – who, it turns out, is the lead suspect in the Miami case. However, the medical examiner determines that he has been dead for 72 hours and could not even have been alive at the time of the double-murder in Miami. After further investigation, Horatio and Mac determine that the real killer murdered the New York cop, then used his ID to get to Miami, and is still on the loose.

After a large yacht slams into a major Miami bridge, the team finds that the man steering the boat was shot and killed before the accident. The victim's wife reveals that their son had been kidnapped and her husband was handing over the ransom – three million dollars worth of jewels. But when the team learns that the jewels were fake, the investigation leads them into a dangerous situation at a jewelry shop that may contain crucial evidence, where Horatio must face the unimaginable when one of the team is killed in the line of duty.

While investigating the murder of man hired to make dirty bombs that terrorists intend to set off in Miami, Horatio finds the bloody fingerprint of his brother, Raymond, who he believed to be dead. However, when Raymond's son is kidnapped, he emerges from deep undercover and the estranged brothers must work together to save the boy. Meanwhile, while processing a crime scene, an unknown assailant holds a gun to Calleigh's head and, after a deadly confrontation in her gun lab, she is left doubting that she can continue as a CSI.

The Mala Noche gang trial is obstructed when the defendant goes free with the help of the witness who is testifying. When a hit ordered by the Mala Noche gang on Horatio finds the people he loves lives are in danger. Delko finds that an ex-lover is disturbing any woman who he is now close to.

In this thrilling season finale, the loss of one of their own is the first hit the lab will take. Getting back to the lab to process the evidence, they find it has been taken over by Federal Agents looking for stolen money from a previous case.

The team investigates the puzzling death of a student and find evidence that Tim Speedle may not be dead.

The evidence on who shot Horatio leads the team to some of most Miami's dangerous including one of their own.

A baby is taken from her mother's arms in broad daylight, and the team must race against time to find her.

Miami's wealthiest appear to be targeted in a series of stabbings and robberies, and evidence leads back to Russian mobster Ivan Sarnoff, who was last seen in prison, mocking Horatio.

When doubt is cast on his murder conviction, a man receives a 24 hour stay of execution very little time for Horatio and the team to reaffirm his guilt or establish his innocence.

When a suburban soccer mom is murdered, the CSIs uncover her family's dark past, while Delko continues his undercover mission.

An escaped prisoner takes Natalia hostage and tells her a shocking secret about his crimes.

In the season finale, Horatio must capture an escapee again when their transport plane crashes. And the team was shocked to discover that the fugitive has planned more than that.

Horatio and his team must uncover the evidence in the brutal murder of an entire family in their own home. The only survivors are a blood-soaked toddler, and the father who's in surgery. The immediate assumption is that the mother is responsible – post-partum depression – but the evidence discloses a different outcome.

The investigation into a drug heist offers brief glimpses into the private lives of the CSIs, whose nerves are on edge when they become suspects in the crime they're trying to solve. A police convoy headed across town includes an unmarked truck filled with confiscated drugs being taken to an incinerator to be destroyed. The trip ends abruptly when thieves hijack the vehicle, kill its driver and shoot Speedle, who was riding shotgun. It's hard for Horatio when the media draw comparisons to a similar case several years ago in which his brother, an undercover cop, was killed. But it's worse for his team when Internal Affairs decides that one of them tipped off the robbers about the delivery.