Frank and his grandson, Joe Hill, contend with a grievous insult to the memory of Joe's father; Erin and Henry work together to bust a scammer targeting the elderly; Eddie's captain takes suspicious interest in her efforts to locate a stolen puppy.
The team investigates a fire on a U.S. Navy ship that was a secret detention site for indicted terrorists; Gibbs goes to his childhood home after his father's passing.
When Gibbs and McGee travel to Russia to escort a computer engineer home, the mission is compromised and they must hide from a Russian mercenary group that is hunting them.
When a lieutenant is murdered on his way to meet the president, the team must determine if his death was a targeted hit or part of a recent series of muggings.
After an investigative journalist is murdered, the team uncovers information linking the suspect to past cases; the victim's death strikes a chord with Maggie, leaving her desperate for answers in regard to a traumatic event in her personal life.
A serial bomber appears to be targeting Wall Street's elite; Maggie and OA search for a suspect who seems set on revenge; Dana deals with Spencer Briggs, a cocky profiler brought in to consult on the case.
The daughter of a wealthy family is kidnapped in an attempt to gain notorious internet fame; Maggie and OA discover the kidnapper's plans go far beyond abduction.
OA and Maggie team up with members of the FBI's Fugitives Department to track down a person wanted for murder who is also on America's Top 10 Most Wanted list.
The team must take down a dangerous drug ring after an American diplomat is killed while being used as a pawn; Jubal and OA try to help friends from their past fight off their inner demons.
When a controversial senior leader from Egypt comes to New York for a heart transplant, OA struggles to balance his personal opinion with his professional duty when he is assigned to the security detail.
After a decorated FBI agent is murdered, the team investigates and learns that the man led a double life; Maggie struggles with what information she should reveal to the agent's widow, who is also her personal friend.
A woman who has information about the death of Maggie's husband is abducted, leading OA and the team to uncover a criminal operation larger than anyone imagined; Dana puts her career in jeopardy when she allows Maggie to work on the case.
After a bomb detonates at a restaurant in Queens, the case becomes personal for OA, who grew up eating there; OA goes under cover to prevent another incident.
After the son of a prominent blogger is kidnapped, the team must sweep through her two million followers to find the culprit; Kristen continues to adjust to life as a field agent with her new partner Stuart Scola.
After a female presidential candidate, Valerie Caldwell, is targeted with a car bomb, OA and Maggie must find them before they strike again; the case leads them to wonder if she is being targeted for her political aspirations or something else.
After a shooting at a nightclub, it appears that the FBI may have ignored previous threats from a local white supremacist group; Kristen wrestles with her commitment to the bureau and her responsibility to her community.