On 6 April 1966, in the Australian suburb of Westall, hundreds watched as a strange object hovered overhead, landed, then lifted off and vanished. Witnesses described it as low flying, silver-grey and shiny, shaped like a ‘cup turned upside down on a saucer’ and accompanied by five light aircraft. Afraid of being ridiculed, many witnesses kept the secret. Some are still angry about not being believed. Others say the incident continues to haunt them.