NCIS: Season 4, Episode 23

4 - 23: Trojan Horse

A man is found dead in a taxi headed to the NCIS headquarters but his body shows no signs of external injuries. Gibbs decides to lead the investigation into the man's death in preference to performing his duties as the Acting Director of NCIS while Jenny is in Paris attending an Interpol conference. When the team discovers that the people whose names were found on a list belonging to the dead man are all dead, Gibbs suspects that the list is a decoy used to distract them.