William Kamm — the convicted paedophile who led the Order of Saint Charbel under the self-styled title 'Little Pebble' — and his partner Sandra Mathison are headed to trial on allegations they groomed a follower from early childhood, according to ABC News reporting from November 2025. Kamm, who also uses the name William Costellia, was granted bail ahead of those proceedings.

The grooming allegations are specific and serious. Prosecutors allege that a complainant was told, at age six, that she had a "beautiful mission from God" to become Kamm's wife. Kamm is further alleged to have sent letters to the child — channelled through his wife — as part of a sustained pattern of contact framed in religious terms. The use of a spouse as an intermediary in alleged child grooming is a detail that bears weight in how prosecutors are likely to construct a joint-enterprise argument at trial.

Kamm founded the Order of Saint Charbel in 1983. The group maintained a compound near Nowra in the Shoalhaven region of New South Wales, where followers lived under the theological framework Kamm constructed around his claimed prophetic identity. He was subsequently convicted and imprisoned for the sexual assault of teenage followers — offences that predate the current proceedings but establish prior judicial findings against him.

The Guardian reported that Kamm and Mathison were arrested in Sydney's CBD in March 2024 following a six-month investigation by NSW Police. That arrest was the gateway to the current trial pathway.

The granting of bail in a late-2025 hearing — given his prior convictions and the nature of the current allegations — will draw scrutiny. Bail decisions in matters involving alleged child victims and defendants with relevant criminal histories require courts to weigh statutory risk factors under the NSW Bail Act 2013, including the likelihood of reoffending and the protection of the community. That Kamm received bail despite that record will be a live issue in any subsequent public discussion of the case.

The structural mechanics of this prosecution matter beyond the immediate facts. Allegations of religiously framed grooming — where doctrinal language is deployed to condition a child's understanding of their own exploitation — present evidentiary challenges distinct from other child sexual abuse cases. Courts must assess whether communications framed as spiritual direction meet the legal threshold for grooming conduct, which in NSW is defined under section 66EB of the Crimes Act 1900. The alleged use of written correspondence, and the involvement of a second person in its delivery, provides a documentary trail that prosecutors will likely treat as central to the case.

Kamm has operated in Australian courts and media for decades. His case is a case study in the long institutional tail of cultic sexual abuse: the original convictions, the post-release monitoring, the fresh investigation, the new charges. Each phase has tested different parts of the legal and child protection system. The current trial will test whether the grooming statutes — tools refined by legislators specifically to capture preparatory conduct before direct abuse — can reach conduct allegedly rooted in religious indoctrination directed at very young children.

The trial date, as of the most recent reporting, had been scheduled but not yet heard as of late 2025. Given that the current date is 23 June 2026, proceedings may now be underway or have recently concluded; no verified outcome has been reported in the sources available to this article.