High-interest series looks at secret campaigns behind the major conflicts of the past 100 years. Biographical sidebars focus on heroic or notorious personalities. Highlighted dfact features include special operations and their results, resistance movements, propaganda and the history of the time, as it is known...and not readily known. "World War I" looks at the hidden world of spys, double agents, assassins and sabateurs, both German and Brish, in this war.