Interview with Author Stuart Mullins

On Australia Day 1966, three children — Jane, Arnna, and Grant Beaumont — were dropped off at Glenelg Beach in Adelaide, South Australia. Their mother expected them home by noon. They never arrived. No trace of the three children has ever been found. Nearly sixty years later, it remains one of Australia's most devastating unsolved cases.

Earlier this season, Midnight Mystery Archive released a two-part deep dive on the Beaumont children. This special interview episode is the next piece of the puzzle.

We sit down with Stuart Mullins, co-author of Unmasking the Killer of the Missing Beaumont Children, written alongside former South Australian police detective Bill Hayes. Stuart was born in Glenelg, the same community where the children vanished, and has spent years building an evidence-based case against suspect Harry Phipps, a man of wealth and influence whose mansion sat just 190 meters from where the children were last seen. The book presents over ten pieces of circumstantial evidence, explores a potential link to the 1973 Adelaide Oval abduction, and reveals conversations with Phipps's eldest son. The latest edition includes three new chapters covering the 2025 forensic dig at the Castalloy factory site where the authors believe the answer may lie buried.

We discuss the case, the research, what it means to pursue a theory with rigor, and what happens when decades of evidence still isn't enough to close the book.

FEATURED BOOK: Unmasking the Killer of the Missing Beaumont Children by Stuart Mullins and Bill Hayes.

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This episode is supported by Invisawear — discreet, wearable safety devices that let you send an emergency alert with your real-time location at the press of a button. True crime exists because real people face real risk, and Invisawear is about getting ahead of it. Learn more at invisawear.com/MidnightMysteryArchive.

Thanks also to Scrivener, the writing software I use to organize research, timelines, and long-form scripts for this show.

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