NCIS: Season 5, Episode 15

5 - 15: In the Zone

When a Marine Captain is killed during a mortar attack, it turns out that he was shot. Tony and Intel Analyst Nikki Jardine are sent to Baghdad to investigate, while the rest of the team assists by investigating stateside. The team uncovers that the man he contracted to provide soil testing hired a civilian contractor in Iraq to murder him when the captain discovers the soil sample was faked. While in Baghdad, Nikki tries to make up for a Marine mistake that led to the death of the man who helped her brother when he was wounded.