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.

Bei der Strandparty eines prominenten Rappers wird eine junge Frau aus einem vorbeifahrenden Boot heraus erschossen. Der Täter kann zwar schnell identifiziert werden, doch die Ermittler ahnen nicht, dass dieser das von vorneherein geplant hat.

Nachdem eine Frau vor einen Bus gestoßen wurde, gerät ihr Freund unter dringenden Tatverdacht. Bei den Ermittlungen stellt sich jedoch heraus, dass der Fall sehr viel komplizierter ist, als zunächst angenommen.

E-mails and text messages trigger a mass gathering of students to perform a random task on a golf course. However, as the crowd disperses, the body of a high school student is found. The original message triggering the "flash mob" is traced to a high school senior whose father is a high-powered defense attorney. The case changes direction when Horatio and the team learn that the schoolmaster's daughter may have had something to do with the murder and evidence reveals that the victim was having an affair with his chemistry teacher.

An 18-year-old girl is stabbed to death in a bathroom of a popular Miami nightclub. Horatio learns that the victim was an investigative aide working for Alcohol Beverage Control and was monitoring underage drinking. As Horatio interviews the club's owner, an unknown man drives by the club, sees that the police are there, and crashes his car while fleeing the scene. However, the case gets more complicated when they discover another murdered victim inside the car. DNA from the second victim's watch ultimately leads them to a day spa where the services may not be entirely legal. Meanwhile, Calleigh and Ryan work together to determine whether an insecure and underage teenager at the club that night had anything to do with the murder.

The wife of a famous baseball player is brutally killed in her home and her philandering husband is charged with the crime. The jury on the case, as well as the accused and his defense, visits the house to examine the crime scene, but when the lights are dimmed, as they were when the victim was killed, and then turned back on, the ball player is found dead with a meat clever in his back and a note that reads "guilty." Now, as Horatio and the team find that the husband's defense team tampered with the crime scene, they must examine the evidence to find the couple's killers. Meanwhile, Horatio gets a call from Yelina, who tells him that her son, Ray, Jr., is missing.

As a huge tsunami heads directly towards Miami, a ten-hour warning gives citizens just enough time to evacuate the city. In the chaos, two people are killed in a parking lot and the evidence leads Horatio to discover a plot to rob a bank timed to take advantage of the evacuation. However, as the CSIs close in on the robbery already in progress, they find that it's a more elaborate crime than they previously thought. In the wake of the storm, Ryan and Alexx discover a body washed up from a local cemetery that may have a different cause of death than originally recorded. Meanwhile, Horatio suspects that Yelina is being physically abused by her boyfriend, IAB's Rick Stetler.

A murder investigation takes Horatio and the team into the world of speed dating. Richard Laken is found killed by a tire iron outside a lounge following an evening of speed-dating. The team discovers his car is covered with acetone, which traces back to one of the female guests. She reveals that she dated Laken and he dumped her, so she doused his car with nail polish remover for revenge, but she didn't kill him. Now, when Horatio and the team learn that Laken recently witnessed a serious assault at a Miami Heat basketball game, they are on the hunt for two perps instead of one.

Als sechs tote Seeleute von einem tauchenden Pärchen entdeckt werden, deutet alles auf einen Akt der Piraterie hin. Doch offenbar haben die Piraten nicht alle Besatzungsmitglieder des betroffenen Schiffs getötet.

Ein Fußgänger kommt auf bizarre Art und Weise ums Leben: Er wird von einem aus einem Gebäude herabstürzendem Mann getroffen. Bei den Ermittlungen stellt sich heraus, dass der Vorfall offenbar kein Unfall war.

When a woman is killed in what looks like a carjacking, the CSIs talk to her husband, the oldest of the three brothers who run their lucrative family business. However, when it is revealed that the victim had a gambling addiction that could have bankrupted the company, the team must follow the evidence to find the killer. Meanwhile, Alexx hires a recovering alcoholic as a body hauler and must investigate when he is accused of stealing from the dead.

When gang-related gunplay goes down in an emergency room, Horatio and the team must find the gang members responsible. The evidence suggests that an orderly in the hospital recognized the wounded gang member, who possibly killed one of the orderly's friends and alerted gang members to his location. However, the evidence doesn't match up and the CSIs discover that a cheating girlfriend, not gang retaliation, may be behind the shooting. Meanwhile, Ryan questions a mother in the emergency room after her story regarding her child doesn't add up.

Bei einer routinemäßigen Verkehrskontrolle wird ein Polizist erschossen. Ein Praktikant, der ihn bei der Kontrolle begleitet hat, ist verschwunden. Die Ermittlungen des CSI-Team führen zu der Schülerin Missy Marshall, die den Beamten auch gleich einen Verdächtigen präsentiert. Doch das Mädchen scheint mehr zu wissen, als sie zugibt...

Ein Hotelpage wird ermordet. Allem Anschein nach fungierte er als Bote für Material, das zur Falschgeld-Herstellung benötigt wird. Daneben hat es das CSI-Team mit dem Mord an einer Frau zu tun, die Gast einer exklusiven "Flirt-Party" war.

When the CSIs find a woman swallowed whole and killed by a gigantic snake, they uncover a covert drug smuggling operation. Evidence leads Horatio and the team to a drug smuggling operation where large snakes are suspected of be being used to bring illegal drugs into the country to avoid detection by customs. However, when Horatio finds that Clavo Cruz, a nemesis of Horatio's who hides behind his diplomatic immunity, may be behind the operation, the team must find a legal way to put the criminal behind bars. Meanwhile, Wolfe must find the truth when two women each claim that they are the real victim of identity theft and the other is the culprit.

Nach einem Großbrand in den Everglades gehen die Ermittler davon aus, dass es sich um Brandstiftung handelt, die von einem anderen Verbrechen ablenken sollte. Dann wird die Leiche des Studenten Paul Travers gefunden. Er wurde erschossen...

Ein Frachtflugzeug mit Schecks im Wert von 1,2 Milliarden Dollar an Bord stürzt ab, weil der Pilot von einem Laserpointer geblendet wird. An Bord finden die Ermittler zudem die Leiche eines aus wohlhabender Familie stammenden jungen Mannes. Dessen Tod, so viel steht fest, ist bereits vor dem Absturz eingetreten...

An extreme skateboarder and videogame tester is found dead on a half-pipe platform used to program extreme skateboarding video games. The CSIs discover that he was wearing reflective sensors when he was killed, so the motion-capture device used to produce these videogames recorded the murder as it happened, but not the murderer. Now the team delves into the highly competitive world of videogame programmers and testers to find the killer.

Horatio und sein Team sind einem Serienmörder auf der Spur, der es auf Steuerbeamte abgesehen hat. Verdächtige gibt es mehr als genug, denn die Frist für die Steuererklärungen lässt in Kürze ab...

Horatio's life is changed forever when he learns important information about his deceased brother. Horatio must now figure out what to do with this information about his brother, Raymond, and whether or not to tell Yelina. Meanwhile, the team investigates when a woman is murdered at a crowded bar after she's approached by a female employee of a service that helps men pick-up women. Also, when Delko loses his badge after some reckless behavior and it's used in a crime, he must locate the badge before it's used again.

After a bitter custody battle, shots are fired outside the courthouse. Bullets fly and the target is the little girl's mother. Horatio goes after the father, who he suspects may not be the girl's biological father after all. However, when the mother's shady past is uncovered, the team finds that she has a lot of enemies who would like to take a shot at her. Meanwhile, Calleigh's father returns to the crime lab for her guidance but for an unexpected reason.

Wiedersehen macht nicht zwingend Freude, wie CSI-Chef Horatio angesichts eines im Rahmen eines Klassentreffen verübten Mordes feststellen muss. Doch welcher der Ehemaligen hat auch 15 Jahre nach "Schulschluss" noch ein triftiges Motiv?

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.