Billy Aaron Brown

After a marine is murdered on the school campus, the team discover a possible suspect but are soon led back to point zero when they find the suspect murdered. Tim and Abby discover a trace in the e-mails that leads them to a Red Cell, and the team believes that the marine was involved in a serious game.

The kidnapping of Dawson's son continues to have ramifications for the team, although the boy is now safe. Voight manages to alienate his own son when his preoccupation with the case prevents him from meeting him upon his release from prison.