A woman falls from the pavement and is hit by a speeding bus. She dies instantly. A hand-shaped bruise on her back convinces both Alexx and Horatio that she was murdered. Calleigh's father thinks that he may have killed someone while driving drunk. Horatio wants someone with no biases to work on the case and assigns the rookie Ryan it. He has just hired him because he is impressed by how clean Ryan's guns are.
A group of teenagers gather at a golf course at a specified time. After the flash mob disperses, a body is found near the site. The CSIs follow the mob to a very prestigious prep school. They manage to trace the origin of the text messages telling the receivers to meet at the golf course to the son of one of Florida's most famous defense attorneys. At the same time, Horatio and Yelina are working to find the killer of a woman found in a dumpster.
A young girl is stabbed to death in a trendy night club. Jenny was an undercover investigative aide working for the Alcoholic Beverage Control. Her target was the club owner. As Horatio is questioning him, a loud noise draws him outside where a car speeds up and crashes into the door. The body at the back of the car leads the detectives to a spa where they suspect that there is something illegal going on.
The jury of a brutal murder of a woman visits the crime scene and a juror falls down with a seizure. After the initial chaos, the defendant, the victim's husband, is found dead with a knife stuck in the back of his head.
After speed-dating 15 women, each 5 minutes, in a South Beach club, Richard Laken is found murdered in his vandalized car. The stylist date who poured the acetone -accessible in her trade- over it admits so, but did so well before the murder, so her story that Laken left early is believed. Indeed, the club's dates record shows Richard left after talking to Rebecca Briggs, who claims he was systematically using their information to commit robberies, but that proves to be the club manager's scam. However at least someone else in the club had a murder motive...
A man is seen falling from an apartment building, yet the corps found there is not his but Michael Johnson, a resident, who was deeply wounded by an unidentified round object. First subject is junkie Doug Ramsey, who is arrested by Horatio for probably abseiling to break in and steal the $100,000 heirloom ring of the condo owner, Edward Mathis, who is however found taking it back after its sale, insurance fraud. The wounding object is found, a CD recording kinky sex scenes of missing Donna Scott and reputedly strict criminal judge Isaac Greenhill, whose former court ...
An explosion at a "Break-In Party" leads to the discovery of a bomb, and a search ensues for the person who ordered it, before it's too late. Meanwhile, Caine and Calleigh each have personal matters to deal with.