When a Navy Lieutenant is killed on his way to a private meeting with the President, the NCIS team must determine if the murder was part of a recent stream of muggings in the area or a targeted hit to keep intel secret.

While visiting a pharmaceutical lab on a murder case, Abby is trapped with no communication to the outside world after armed men take over the building and hold everyone hostage.

When a missing MI6 Officer is linked to a murdered petty officer, Gibbs sends Quinn and Bishop to Philadelphia to work with MI6 Officer Clayton Reeves. Also, Quinn painfully recounts the NCIS case that made her leave field work.

After a kidnapped petty officer escapes her captor, NCIS uncovers a connection to her missing husband. Also, Abby knits the NCIS newbies personalized gifts.