A drug kingpin on trial for murder puts a million dollar contract out on a punk rocker who is the star witness for the prosecution. The FBI want Crockett and Tubbs to safe house the witness, but keeping him alive is going to be a challenge.
Crockett and Tubbs have their efforts to bust a shady business man denied time and again by an attorney and his daughter, Lisa. She also happens to be the one who could testify and close the books on the case for the Police.
Aside from chasing bad guys as usual, Crockett must also attend to family matters. His son, Billy, has begun to break away from his old self in the wake of his new life and family. Crockett goes on leave to spend time with him.
Crockett's cousin, Jack, comes to Miami to visit Sonny for the first time since he moved there. However, it is soon revealed that Jack is in serious debt with a drug dealer who will stop at nothing to collect.
When a routine bust goes bad, the team gets approached by a group of rogue cops who have their own vigilante justice in mind. Castillo approves Crockett and Tubbs decision to infiltrate the group, but when one good cop is killed, that decision comes into question.
Crockett and Tubbs are meeting with a drug dealer when someone comes in and starts shooting killing the drug dealer. When the shooter strikes again but this time not killing a drug dealer but an old man. They realize that an old man who was where when they were meeting the drug dealer was the actual target and that the two men are World War II death camp survivors. They learn that the men along with a few others were scheduled to testify at the hearing of a suspected Nazi who's living in Miami. So Crockett goes undercover joining a group a modern Nazis.
Backdoor pilot about the Young Victims Unit, a new squad of undercover officers. They're put to the test when a new deadly drug begins to circulate on a college campus in Miami. They suspect a reputable but dangerous college professor.
Valerie returns to Miami to help a friend turned junkie, whose teenage daughter is being preyed upon by her abusive drug dealer. She also hopes of possibly rekindling her romance with Tubbs. Meanwhile Stan returns to his gambling ways.