A Question of Loyalty plunges into the seven-week Washington trial of Gen. William "Billy" Mitchell, the hero of the U.S. Army Air Service during World War I and the man who proved in 1921 that planes could sink a battleship. In 1925 Mitchell was frustrated by the slow pace of aviation development, and he sparked a political firestorm, accusing the army and navy high commands — and by inference the president — of treason and criminal negligence in the way they conducted national defense. He was put on trial for insubordination in a spectacular court-martial that became a national obsession during the Roaring Twenties.

Uncovering a trove of new letters, diaries, and confidential documents, Douglas Waller captures the drama of the trial and builds a rich and revealing biography of Mitchell.