Unmasking the Killer of the Missing Beaumont Children

An unsolved crime so heartbreaking, it shook Australia to its core and changed the country forever

By: Stuart Mullins, Bill Hayes

Narrated by: Stuart Mullins

Now with three new chapters, author Stuart Mullins and former South Australian police detective Bill Hayes expose Harry Phipps as the prime suspect in the abduction, disappearance, and likely murder of the Beaumont children, one of Australia’s most notorious cold cases since 1966.

On Australia Day 1966, Jane, Arnna, and Grant Beaumont were abducted from Colley Reserve, Glenelg, South Australia and never seen again, leading to one of Australia's most extensive police investigations and manhunts. Five decades later, no trace of the children has ever been found.

Over the years, several individuals have been put forward and investigated, resulting in false leads and dead ends, and with no real suspect until now: Harry Phipps. On the surface, he was a gentleman: generous, charismatic, and intelligent – a person of wealth and influence in the community. However, a dramatically different person resided behind the walls of his Glenelg mansion.

In Unmasking the Killer of the Missing Beaumont Children, author Stuart Mullins and former South Australian police detective Bill Hayes expose Harry Phipps as the prime suspect in the abduction, disappearance, and likely murder of the Beaumont children.

Over ten pieces of circumstantial evidence linking Phipps to the Beaumont abduction are explored in detail, supported by geographic and predator profiling chapters, which detail how these monsters operate. The authors explore a potential link to the 1973 Adelaide Oval abduction of Kirste Gordon and Joanne Ratcliffe and reveal conversations with Haydn Phipps, the eldest son of Harry and a possible eyewitness to events on that fateful day.

Stuart and Bill answer the question: where to next? Along with other experts, they firmly believe the answer to this baffling mystery lies buried at Castalloy, a factory once owned by Harry Phipps.

This edition features three new chapters of material covering the 2025 forensic dig at the Castalloy site and further chilling, deeply disturbing and unsettling allegations against Phipps and possible accomplices.

Unmasking the Killer revealed everything needed to know about this horrific event.

A very compelling and captivating narrative I couldn’t put down until the end. The case of the missing Beaumont children has been a mystery for decades. This true crime story goes into great details about the events that lead to the children’s abduction and who is the prime suspect. It also left a sick feeling in my stomach that there are, and always have been, so many disturbed and perverted predators in our society. Why parents must keep a close watchful eye on their children at all times in public spaces.