The bizarre will dispute spans the globe and stretches back almost 90 years.
To understand why 88-year-old Hazel Gowland is laying claim to a reclusive American heiress's millions, you need to go back in time to 1925.
In 1925, when the copper king of Beaut Montana Senator William Andrew Clark died, it was thought he didn't have a will. His estate millions were therefore deemed to be up for grabs.More stories from Today Tonight
The copper king had ties to Australia because his brother Samuel had emigrated here in the late 1800s.
Samuel had eight children, and one of them was Elizabeth - Gowland's grandmother.
When their uncle William died in 1925 his eight Aussie nieces and nephews launched a claim on his estate.
Gowland's grandmother and her siblings were unsuccessful however because it turned out the copper king did have a will, which left his entire fortune to his only living child - a daughter from a second marriage, whose name was Hugette.
She was a New York socialite but went into hiding at the age of 22, never to be seen in public again.
She lived a solitary life while her three fabulous homes, including a large apartment on Fifth Avenue overlooking Central park, sat empty for decades.
For twenty years she lived in a private Manhattan hospital, until she passed away last year at the age of 104.
With no children or husband to inherit her half the $500 million fortune, the battle for the Clark millions has begun once again.
This reporter is on Twitter at @PippaGardner7