Colonel Zack Kelly escorts Blake Lannigan to Gettysburg, and she disappears on the battlefield. Zack, who suffers from post traumatic stress disorder from his three tours in Afghanistan, has no memory of what happened although he believes he heard hoofbeats. He becomes the FBI's number one suspect. Zack's search for Blake takes him to Washington D.C. where a member of the Irish Mafia attempts to kill him; to Galway Ireland to determine why there's a contract on his life; then back to Washington to unravel a mysterious Irish connection.
In Zack's corner are Irish medium Shelia O'Donnell, and his partner on the President's National Security Advisor's Task Force, Lieutenant Colonel Rene Garcia.
