Within weeks of the Pearl Harbor attack and the declaration of war on the United States by Germany and Italy, US war plans included the defense of the East Coast and the invasion of Sicily. Here, Ezio Costanzo examines the many elements of this secret scenario, which included long-suppressed information about cooperation between the Mafia and the US Army. The results came in the aftermath of the invasion, during the new military government that gave many Mafia leaders important administrative positions. Seen from an Italian standpoint, the success of US forces is examined in detail and many questions are finally answered.