A man desperate for justice creates a hostage situation at the Miami/Dade Police Department, and Horatio looks into his claims. One of the hostages is Jesse Cardoza, a former CSI who is returning to his old job.
The team finds the body of a dead census report taker in the trunk of a car, and the investigation takes a dangerous turn when it leads Wolfe and Boa Vista to a booby-trapped meth lab in an abandoned foreclosed home.
A man is chopped in half, and the lab tries to tie the case to a Japanese mobster, who seeks custody of his biological son, who was adopted by the victim. Meanwhile, Natalia's hearing loss nearly makes her a victim during the investigation.
A pornographer who was acquitted in Los Angeles for the murder of his wife is suspected of killing anther woman in Miami. Horatio and Delko travel to L.A. to further the investigation--and clear Jesse's Cardoza's name.
While investigating a murder that takes place during a diamond heist, the team discovers that the culprits weren't after the diamonds. Meanwhile, a package of diamonds is stolen from the evidence box at the crime lab.
Horatio suspects that a disgraced graduate psychology student is killing the people who caused her to fail, and is leaving cryptic messages for the crime lab. However, could it actually be part of an even more sinister plan?