Rogue Element

In the early hours of the 13th of February 1978 outside the Sydney Hilton Hotel, a bomb detonated in the rear of a garbage truck killing to City Council garbage men and wounding several police officers, one of whom later died from his injuries. This much is fact.
The Hilton Hotel was the venue of the first Commonwealth Heads of Government Regional Meeting.
Who had planted the bomb and why?
This question has never been answered although arrests were made. Those arrested were later exonerated.
Why were the garbage men ordered not to empty the rubbish bins? Why were the bins not checked for bombs prior to and during the meeting?
Why was vital forensic evidence taken from the scene and buried in a secret location before a thorough examination could be made, and by Whom?
Was the answer to be found in the meeting agenda? Was it the work of the Ananda Marga? Or was there another reason, a reason much more sinister?
Who had the clout to ensure that those guilty of this crime could escape punishment? And why has the Australian Government, given that the meeting was of Commonwealth leaders, twice refused the NSW Government's call for an enquiry, stating that this was a State matter and that the Federal Government had no interest or jurisdiction?
This novel takes disparate pieces of information, freely available in the public domain, and links these to construct the story of the conspiracy behind this event.