With Australia at war in Vietnam in 1967, suddenly Prime Minister Harold Holt disappeared without a trace–an event unparalleled in the history of western democracy. Four decades after Harold Holt's bizarre disappearance at Cheviot Beach, a coronial inquiry confirmed that he had accidentally drowned. Some people may still believe that Holt was a spy and fled to China in a submarine. But most suspect that there was more to his disappearance than has ever been revealed. Reconstructed from eyewitness accounts, this dramatised documentary investigates all aspects of the mysterious case and asks why the nation's leader entered such violent surf that day. Do gaps in the police investigation and recently discovered classified documents suggest an answer?