Lasalle finds a link that connects the New Orleans Police Department to an international drug operation; Rita investigates the mayor for illegal activity.
The deputy commander of an Air National Guard Base is forced to give out access codes, leaving the team to track down the kidnapper and stolen ammunition.
The team investigates after a drug dealer is shot in a federal park, but the return of Maggie's sister ends up throwing a wrench in their investigation.
A money-laundering ring and two women, who previously avoided conviction, is discovered after Detective Benson's number is found on a dying person's phone.
When an undercover reporter posing as a prostitute turns up murdered, the trail leads police to a father trying to protect his imprisoned son from gang thugs.
Detectives are on the trail of a depressed wife suspected of killing a pregnant woman and stealing her baby, although someone else may have also been involved.
The facially-scarred daughter of Van Buren's friend is found dead, prompting a mission to find the assailant who threw acid on the girl months earlier.
A man is murdered after desecrating a valued edition of the Hebrew Torah, and as detectives investigate, they find he was paid by his cousin to defile the book.
While Pride listens to activity on a wiretap aimed at Mayor Hamilton, members of the NCIS team are sent to investigate the events behind a train heist.
After a Navy chaplain and a minister are found murdered, Pride thinks there is a connection between a mayor and illegal activities occurring in a nearby city.
When Pride is found following one of Mayor Hamilton's accomplices, the suspect decides to open fire in a crowded area to use the chaos as protective cover.
The NCIS team races the clock after an unknown shooter causes chaos at an annual Thanksgiving 5K race; Kasie goes to Knight's sister's house for Thanksgiving.
NCIS agents from around the country gather in Washington, D.C., to attend the retirement party of a beloved professor only to end up investigating his suicide.