The Society of the Black Arrows, an ultra-extremist group in Italy, is unhappy with the 'moderate' measures the current fascist government there is taking and wants to overthrow it. The Duce, Cafarelli, appeals for help from Colonel Granby who sends ace Intelligence agent John Cowper. Cowper will find allies and enemies both in places he never expected. Told in the third person centered around Cowper's activities.