When a dying Marine confesses his involvement in covering up the murder of an Iraqi civilian more than a decade ago, Abe and Trey are assigned to prosecute the accused killer - a sitting U.S. congressman. Also, Maya helps her brother prepare for his state senate race.

Abe and Harper travel to Afghanistan to investigate when an Afghan commander is killed on a U.S. base. When a Marine is accused of the crime, Trey and Maya join their colleagues to defend him in an on-base hearing. Col. Turnbull and her husband, Asa, disagree about how to handle their son Adam’s physical therapy.

Abe and Harper’s investigation into a Marine recruiter’s alleged misconduct may be derailed when the key witness refuses to testify.