By Order of the President — Michael Kilian

When an assassin targets the president, an outsider finds evidence of an even deeper conspiracy in this thriller from the author of The Valkyrie Project.

The gunman crouches in his crawl space, dreaming of revenge. The United States has turned his homeland into a combat zone, killing his family and ruining his life. Today, vengeance will be had. President Henry Hampton is visiting Gettysburg, and the band has just struck up “Hail to the Chief” when the first shots ring out. Blood stains the old battleground once more. The president takes a bullet to the neck, and his bodyguard hustles him into his limousine -- rushing him not to a hospital, but to Camp David, where he can be best protected against the conspiracy that threatens to consume America from the inside out.
 
As days pass with only vague news about the president's condition, the country threatens to slide into chaos, and it will fall to 2 unlikely heroes to rescue the government: a California adman and the desperate vice president of the United States.