This is the untold story of an American hero, the man who resurrected a long-unused military code - the Tap Code - that bolstered weary Vietnam POWs who endured torture and abuse at the infamous "Hanoi Hilton" prison. It's a true story of ingenuity under pressure, strength and dignity in the face of the enemy, the love of family, and the hope, faith, and resolve necessary to endure even the darkest circumstances.When Air Force pilot Captain Carlyle "Smitty" Harris was shot down over Vietnam on April 4, 1965, he had no idea what horrors awaited him in the infamous Hoa Lo prison - nicknamed "Hanoi Hilton." For the next eight years, Smitty and hundreds of other American POWs - including John McCain and George "Bud" Day - suffered torture, solitary confinement, and abuse.Their dignity was taken, their wills were challenged, and their bodies were bruised and battered. In the midst of the struggle, Smitty remembered once learning the Tap Code - an old, long-unused World War II communication code. He covertly taught the code to many POWs and in turn they taught others.Simple and effective, the Tap Code quickly became a lifeline to hundreds of military prisoners during their long internment and, ultimately, changed the course of the war.Told by both Smitty and his wife, Louise, Tap Code shares behind-the-scenes details of American history while weaving in their inspiring story of true love, honor, and courage as husband and wife endured the hardest circumstances they had ever faced.