To send a message to Pride, Baitfish murders someone close to the NCIS team, prompting a citywide manhunt for the elusive criminal. Dylan Walsh guest stars.

The NCIS team partners with several federal agencies to track a sniper who is targeting crowded events in the city. Also, FBI Special Agent Tammy Gregorio arrives to investigate Pride and his team.

When the Coast Guard boards a yacht that is in an area that is used by smugglers, they find the Captain with the crew's waiter who is dead. They try to get him but he resists and kills him. The Coast Guard calls Pride because the yacht belongs to Javier Garcia. Pride thinks Garcia was smuggling something. He calls the FBI to tell them about it and sends LaSalle to help Gregorio. Pride discovers one of the passengers is someone he knows and that she's engaged to Garcia. Instead of arresting the men who took off the yacht what they were bringing in Gregorio decides to follow them instead if arresting them but things don't work out as planned. Isler wants Pride's friend to help them but Pride says it's too dangerous but she agrees to do it.

After thousands of classified government files are stolen, the NCIS team searches for an underground group of hackers co-founded by Pride's old contact, Elvis Bertrand, who are known for exposing corruption among prominent people in New Orleans. Also, Sebastian joins the team as a newly minted NCIS Special Agent.