This title explores the background and the aftermath of the assassination of Kennedy, using this single event as a window on to a broader perspective of twentieth century history. It looks at Kennedy's impact as a US president through crucial events in history such as the Cuban Missile Crisis, building up to the climatic assassination itself. It then explores how and why Kennedy was assassinated and tantalizingly asks 'What if it hadn't happened?' Throughout the book 'moment in time' panels which use quotes and primary sources give the reader an impression of what it must have been like to be there. The final part of the book examines the legacy of the 'day that shook the world' in terms of its impact on history.