Child's Play

After the body of a Marine is discovered in a corn field, the team investigates at a military intelligence base that uses genius children to crack military codes. The team discovers that one of the children is making collages that contain codes with important military secrets in them, secrets that are being sold. A second dead body points to the woman running the organization, but when the young girl escapes from the safe house (Ducky's house) and runs home to her mother, the team must race to save her from her would-be murderer. Meanwhile, Ducky attempts to convince Gibbs and the team to spend Thanksgiving at his house, in spite of previously made plans.