His devotees call him Little Pebble; his victims know him as a paedophile.
William Costellia Kamm is the self-appointed leader of a notorious doomsday cult that formed its headquarters in 1987, based in a secure compound in Cambewarra, just outside Nowra on the NSW South Coast.
At its height, thousands of pilgrims from around the world travelled to the bush setting for a spiritual experience like no other.
On the 13th day of each month, the Virgin Mary would appear to William – her apparition only visible to him – and he would pass on her messages and warnings to the gathered and devout crowd.
He declared his compound the Holy Ground, a new promised land for his followers for when the apocalyptic second coming of Christ would wipe out most of mankind.
At the time, Kamm was married and had four children but unknown to his wife, this self-proclaimed Messiah was planning on creating a royal harem, filled with 12 queens and 72 princesses – 84 mystical spouses to bear his children to repopulate the earth.
Little Pebble claimed God chose who his brides would be but as Detective Chief Inspector Peter Yeomans from the State Crime Command puts it, it was Kamm who did all the grooming, and his preference was under-age girls.
“He was using religion in such a way that just split families. So, it was just awful and it continued for many many years. I see it as grooming with the families to get to these children and it’s just terrible,” he says.