Aboard Air Force One a Naval officer dies after eating with the POTUS. After an unscheduled stop in Wichita, agents of the FBI, NCIS, and Secret Service all compete to control the investigation. The NCIS agents win, and they and the body return to Washington aboard a presidential 747. Then, in Georgetown, a Marine Corps officer also dies in the same way. Abby discovers both the cause of the deaths and the manner of the delivery of the lethal substance. Gibbs flies with Kate, a Secret Service agent, to the West Coast, then rides the alternate Air Force One back to Washington. During the return flight Gibbs thwarts an attempt to assassinate the POTUS. Kate resigns from the Secret Service, and Gibbs gives Kate an implied job offer.
—DocRushing