When a man is found stabbed to death in his home, Nagel and Antonio discover he was an ex-Navy SEAL who was writing a book that exposed the truth about a top-secret mission.  Stone becomes convinced that the SEAL was killed to suppress the real story of what actually happened on the failed mission.  But the US Department of Justice steps in and insists that this strong evidence of motive is classified, thereby jeopardizing Stone's case.  When Stone defies Jefferies and uses the secret evidence, will it cost him his job?