When NCIS team member Shel McHenry discovers that his father is missing, he turns to Commander Will Coburn and the NCIS team. Their investigation takes them to Vietnam, where the team discovers a drug ring that has existed for more than forty years. The leader of the drug ring murdered a man during the war to hide his illegal activities. A crime he blamed on Shels father. A crime that Shels father had kept hidden for years. Now that he knows the truth, he no longer has to live with the guilt that caused him to withdraw from his son. Only now can he find true forgiveness.