The Siege: Part One - a Four Corners special two-part investigation. Four Corners will present the first episode in a two-part special investigation into the Lindt Cafe siege. Sarah Ferguson talks exclusively with the families of Tori Johnson and Katrina Dawson about their experience on the day and their devastation, anger and frustration in the aftermath of the siege. Surviving hostages recount their terrifying ordeal as they waited, hour after hour, for the police to arrive. The program examines how authorities over several years failed to comprehend the risk posed by hostage taker Man Haron Monis. Part two of the investigation will take you inside the Lindt Cafe and the police operation on the day, and bring you a forensic examination of how the disaster unfolded. This special investigation exposes what went wrong and questions whether Australia is prepared for another terror attack. The NSW Coroner will deliver his findings on the siege on Wednesday May 24.

Four Corners is Australia's premier television current affairs program. It has been part of the Australian story since August 1961, exposing scandals, triggering inquiries, firing debate, confronting taboos and interpreting fads, trends and sub-cultures. Its consistently high standards of journalism and film-making have earned international recognition and an array of Walkleys, Logies and other national awards.