
Naval Criminal Investigative Service Special Agent Leroy Jethro Gibbs leads a group of colorful personalities in investigating crimes -- ranging from murder and espionage to terrorism -- that have evidence connected to Navy and Marine Corps personnel. The team includes MIT graduate Timothy McGee, Ellie Bishop, who specializes in international threat assessment, charismatic and unpredictable Nick Torres, and forensic psychologist Jack Sloane. Dr. Donald "Ducky" Mallard brings his vast experience in forensics into play to help solve cases.
The Department of Defense, including Gibbs' ex-girlfriend, helps the team search for a stolen drone linked to an elusive terrorist.
Gibbs and McGee head to Alaska while the team works at home to uncover the conspiracy behind the serial killer.
The team tracks down one of Parsa's cohorts by using evidence from the drone attack; McGee remains emotionally shaken.
With Special Agent Alden Parker still on the run with his ex-wife, the team investigates who from his past might have a personal vendetta against him in hopes of clearing Parker's name.