 When Brennan and her team investigate the apparent suicide of a protester in Arlington National Cemetery, they discover it wasn t suicide but the murder of a soldier who served in Iraq. As Booth and Brennan pursue the murder investigation and interrogate the American soldiers the victim served with in Iraq, their investigation leads to many unanswered questions about the victim s military unit in Iraq and the actions they took while on patrol there. As more information about the case is uncovered, the clues indicate a potential military cover-up. The case brings back many memories for Booth of the horrors of war and elements of his own  shady  past as a sniper are revealed.