"Chasing Ghosts" is the 20th episode of the tenth season of the American police procedural drama NCIS, and the 230th episode overall. It originally aired on CBS in the United States on April 9, 2013. The episode is written by Nicole Mirante-Matthews and directed by Arvin Brown, and was seen by 17.22 million viewers.While the team takes a missing persons case, Tony is disturbed by Ziva's way of coping with her father's death.