The team continues to race against the clock as they hunt for the killer who took the life of one of their own.

When a former NCIS agent is found dead, Director Shepard heads to L.A. for the funeral with Tony and Ziva in tow. But an old assignment that Jenny was on with the deceased, comes back to haunt her, in a big way.

Palmer is put in grave danger after he gets shot at while at a crime scene. However, while he's the only one to have seen the shooter, a mental block prevents him from being able to describe the shooter's face, leaving Tim and Abby to try to help him work through it.

While on an undercover mission, Ziva's life is put in grave danger when the serial killer she's been tracking becomes suspicious of her.

Two members of the NCIS team are sent to Baghdad to investigate a mortar attack that turned into murder.

The dead body of La Grenouille finally surfaces and the entire NCIS is put under the investigation by the FBI, with Jenny as the prime suspect for his murder.

When a Navy dog handler is found murdered, the NCIS team must determine if his dog is responsible; and Abby decides to fight for the dog's life by trusting her instinct about the dog's innocence.

The NCIS team goes on a stakeout in a warehouse to catch a suspected thief of a high-tech naval radar, but they accidentally end up witnessing a murder. Meanwhile, Ducky hides a secret from the rest of the team.

After a young Muslim Marine is murdered near his Mosque, Ducky refuses to perform autopsy due to his religious beliefs, so the NCIS team tries to talk to the father of the deceased, and they send McGee to plant a bug in the Mosque, only to discover that the FBI already planted their bug.

While trying to track down a delusional and violent Marine who thinks he's still in Iraq, the NCIS team will learn that the man may have been the subject of a secret experiment - and it comes with a high price to pay.

The NCIS team has to babysit a 9-year-old son of a missing man, a survivalist who is somehow connected to a cold case murder. The investigation leads the team into the wilderness, where they discover a shocking truth about the man's past.

A murder investigation of a Navy Rear Admiral takes a shocking turn when a woman, a political refugee, returns home to search for her husband.

Gibbs finds himself emotionally challenged when he agrees to investigate a crime connected to a friend of his daughter, who was killed years ago, and the investigation leads to a shocking conclusion.

While investigating a mysterious death on a top-secret naval research ship at sea, the NCIS team finds it abandoned and containing a deadly secret that may cost them their lives.

The NCIS team is called in to stop a naval officer from committing suicide by jumping off a rooftop, but when the suicide attempt turns into a murder, the NCIS team will have to find out who did it.

When Ducky realizes that one of his cadavers used for research is actually a victim of murder, the NCIS team identifies him as a criminal genius who is capable of deleting the past.

Lt. Colonel Mann joins Gibbs in an investigation of the murder of a Marine Captain who had access to highly classified information. Things get very personal for Gibbs when one of the witnesses in the case turns out to be one of his ex-wives.

During an autopsy, Ducky makes a startling discovery that turns a murder of a Petty Officer into a search for a missing infant. Meanwhile, Tony has to deal with his feelings for Jeanne.

The NCIS team uncovers a huge secret, as their mission to capture La Grenouille comes to an explosive and deadly conclusion.