Captains John Abraham and Maya Dobbins head to a war zone when they are assigned to opposite sides of the courtroom in the case of Marine charged with abandoning his post during combat, resulting in the deaths of three soldiers. Also, Major Trey Ferry must iron out a diplomatic spat, and Lt. Harper Li works to balance her duties to the Corps with planning her wedding.
Major Ferry and Lt. Li are assigned to find out who leaked information about a Marine who was set to become the Corps’ first female Infantry Captain, which may have led to her attack. Also, Capt. Abraham is approached by his best friend’s widow, Alex, who is considering suing the Corps for her husband’s wrongful death and may ask him to testify.
Abe and Harper try to track down a website owner who is inciting violence by having Marines confront and expose civilians who are publicly pretending to serve in the Corps. Also, Abe’s relationship with Alex becomes more complicated; Rami faces a crisis of conscience when he and his wife, Nazil, go for their citizenship test; and Col. Turnbull anxiously awaits word on her son’s status after she approves an overseas airstrike.
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. Also, Col. Turnbull and her husband, Asa, disagree about how to handle their son Adam’s physical therapy.
Abe and Harper’s investigation into the accidental overdose of a Marine takes a turn when they can’t find any fingerprints – even the deceased’s – on the pill bottle, leading them to believe he was murdered. Also, Abe receives a warning about testifying in a lawsuit against the Corps, and Maya is concerned that her brother does not have his mental illness under control.