This week on the season finale of 'NCIS: New Orleans', after receiving intelligence that the ports have been breached, placing the Navy and the Gulf Coast in harm's way, Pride and the NCIS team follow every angle to know what has entered their city and how they can put a stop to the Broussard Syndicate.

Last week, Baitfish warned LaSalle that a storm is coming to New Orleans, and it's something bigger than anything that they know. Before LaSalle can get the information out of him, a shooter kills Baitfish, leaving the NCIS team to ponder what he meant.

Pride gathers the team to talk about Baitfish's murder and the coming storm that he mentioned before his death. They think that they might have a mole somewhere in the city.

Later, a logistics specialist was found dead at the ports. Before Naval Officer David Hanson was killed, the team thinks that out of all the containers, only one was opened and it appears that someone was living in that container.

Pride suspects that Councilman Hamilton is the mole, and he turns to his father—Cassius Pride—for help. Pride visits Cassius in jail, but his father tells him that he can't help him because he's given up on all that a long time ago, and all he wants to do now is take care of his little garden in prison.

Based on the DNA found on the containers, Sebastian learns that the woman who was living there is of South American descent. The team learns that some Ecuadorean women have been reported in the area. The team, along with Agent Percy and the ATF track down the women, and they learn that they were being trafficked. Hanson was about to rescue them before he got shot at the ports. The women tell them that the murderer had a fire and machete tattoo.

The team identifies the murderer as Solomon Ekpo, a West African terrorist. Later, Cassius tells Pride that their mole is Captain Messier, and upon tracking him down they find out that Messier has been tortured by Ekpo.

A mortar is stolen from the Navy base, and the NCIS team learns that the terrorist group is targeting the nuclear plant. As they prepare to launch it, Pride and LaSalle arrive and shoot at the terrorists. Pride locates the stolen mortar and kills Ekpo's lieutenant before disabling the mortar, with Percy guiding him on how to do it. Ekpo catches Pride disabling the mortar, but LaSalle gets there in time and shoots Ekpo before he can shoot Pride.

Later, Percy asks to be a member of the team, and Pride tells her yes. He also writes a letter to the parole board, saying that his father is a changed man and that he deserves another chance.