William Kamm — a convicted child abuser who led the Order of Saint Charbel and called himself 'Little Pebble' — and his partner Sandra Mathison are facing trial on allegations that 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 before trial.

The specific allegations are stark. Prosecutors say that at age six, the complainant was told she had a "beautiful mission from God" to become Kamm's wife. He is also alleged to have sent letters to the child through his wife as part of an extended pattern of contact framed in religious language. The involvement of Mathison as an intermediary is a detail prosecutors may use to argue that both defendants participated in a coordinated scheme.

Kamm founded the Order of Saint Charbel in 1983. The group operated from a compound near Nowra in NSW, where followers lived according to a religious framework that Kamm developed around his claim to have prophetic authority. He was previously convicted and imprisoned for sexually assaulting teenage members — crimes that occurred before these current allegations but establish a judicial record of similar conduct.

The Guardian reported that Kamm and Mathison were arrested in Sydney's CBD in March 2024 following a six-month investigation by NSW Police. This arrest set the case on its path to trial.

The decision to grant bail in a late-2025 hearing — given Kamm's prior convictions and the nature of the charges — is likely to draw public attention. When courts grant bail in cases involving alleged child victims and defendants with relevant criminal records, they must weigh risk factors under the NSW Bail Act 2013, including whether the defendant is likely to reoffend and whether the community needs protection from them. The fact that Kamm received bail despite this history will feature in public discussion of the case.

The legal architecture of this prosecution matters beyond the immediate facts. When grooming allegations involve religious language — where theological framing is used to shape a child's understanding of their own abuse — courts face distinct evidentiary questions. Prosecutors must show that communications presented as spiritual guidance meet the legal definition of grooming under section 66EB of the NSW Crimes Act 1900. The alleged use of written letters, combined with the involvement of a second person in their delivery, creates a documentary record that prosecutors will likely treat as central to their case.

Kamm's involvement in Australian courts and media extends over decades. His case illustrates a familiar pattern in institutional sexual abuse involving religious groups: the original convictions, monitoring after release, a fresh police investigation, new charges. Each phase tests different parts of the legal and child protection system. This trial will test whether laws designed to capture grooming conduct — behaviour that prepares a child for abuse — can reach conduct rooted in religious indoctrination of very young children.

As of late 2025, the trial was scheduled but had not yet been heard. Given that we are now in mid-2026, proceedings may be underway or recently completed; no verified outcome has been publicly reported.