The NCIS team puts an informant in protective custody during a murder investigation; Pride needs help from his brother in order to become trusted by informant.
After a Navy contractor is mysteriously murdered, the team begins their investigation and unearths evidence that they lived two separate lives for decades.
Pride is taken by two masked men during a sunrise jog and forced to perform a series of tasks for them in order to protect a captive Wade and his father.
Lupo and Bernard investigate the murders of three homeless men that they believe to be the work of a serial killer, though key evidence throws it into doubt.
A young war veteran's murder is connected to a law professor who worked for the Department of Justice, but the victim's psychological state is questioned.
A CSU investigator is murdered, and Lupo and Bernard don't believe her fiance; another attack contains similar DNA; ethical questions are raised over the case.
A musician's murder is connected to the alleged kidnapping of a girl, but evidence and circumstances lead Lupo and Bernard to suspect something larger.
Lupo and Bernard respond to a deadly drunk-driving accident, where they find a suspicious nasal spray, and the examiner's identification leads to a suspect.
An elderly man defends his shop from an armed robbery, but evidence makes Bernard and Lupo believe it was an inside job meant as a scare tactic for a shakedown.
Lupo and Bernard trace the steps of a man who served as a campaign volunteer before being murdered, uncovering a perplexing past and multiple suspects.
The team investigates the murders of a Muslim college student and his younger brother and discover that the victims were wrongly targeted as terrorists.
An anti-gun lobbyist building is the victim of a bombing attack with the threat of more to come; OA is tempted with a suspicious promotion with conditions.
A murder victim that has been bound with a distinct knot has ties to a cross-country serial killer with the same style that also relates to Isobel's father.
An ICE vs DEA hockey game ends with an agent dead, leaving the team to search for the killer while also protecting a congressman they think might be next.