A two part examination of the terrorist bombing of Pan Am Flight 103 with Sam Donaldson (ABC) and Diane Sawyer (ABC): Part one consists of taped segments by Donaldson, Sawyer, Pierre Salinger (ABC), Chris Wallace (ABC), and Judd Rose (ABC) with Pan Am Chairman C. Edward Acker, former Alert Security Company President Fred Ford, former El Al Airlines Security Chief Isaac Yeffet, PLO Deputy Chief Abu Iyad, former Alert employees Sabine Feuchs and Simone Keller, former Alert Head of Training Alan Gore, former Alert Operations VP Wilfred Wood, former FAA Security Chief Billy Vincent, US Moscow Embassy Consular Assistant Karen Decker, former Alert Supervisor Beata Franski, members of The Four Tops musical group, victims' friends and relatives Richie Grimaldi, Wendy Giebler, Annie Lerow, and Eleanor Bright, Scottish Air Controller Allen Top, Lord Advocate of London Peter Fraser, Chief Constable George Essen, and Victor Kalaga of Yorkie Clothing. Part two includes an update re: a coup attempt in The Philippines with Kathleen Barnes (ABC), and an excerpt of TV speech given by Philippines President Corazon Aquino, a review of information presented in part one, and a live discussion with Donaldson, Sawyer, Salinger, Wallace, Sen. Frank Lautenberg, former Counterterrorism Ambassador at Large Clayton McManaway, Arik Arad, former FBI Deputy District Director Ken Walton, and victims' relatives George Williams, Bert Ammerman, Dan Cohen, Giebler, John Root, Bob Monnetti, Barbara Zwynenburg, Bonnie O'Connor, Mary Ellen DeSantis, and unidentified others.