The latest film by Martin Scorsese traces the trajectory and tragedy of the real-life Osage murders.

Here’s what Grann uncovered, and how Scorsese interpreted it.

Warning: This article contains spoilers forKillers of the Flower Moon.

JaNae Collins, Lily Gladstone, Cara Jade Myers and Jillian Dion in “Killers of the Flower Moon,” coming soon to Apple TV+

Lily Gladstone in ‘Killers of the Flower Moon’.Apple TV+

Eventually, the Osage settled in “Indian territory,” in modern-day Oklahoma.

Headrights could not be bought or sold, only inherited.

This became extremely important just a few years later, when oil fields were discovered under the Osage land.

Lily Gladstone and Leonardo DiCaprio in “Killers of the Flower Moon"

Lily Gladstone and Leonardo DiCaprio in ‘Killers of the Flower Moon’.Apple TV+

Both had been shot, and their bodies had been dumped in isolated rural areas.

He had been shot in the back of the head.

Twenty-four people were eventually murderedin what the tribe began to call the “Reign of Terror.”

Robert De Niro and Jesse Plemons in “Killers of the Flower Moon,” coming soon to Apple TV+

Robert De Niro and Jesse Plemons in ‘Killers of the Flower Moon’.Apple TV+

Some victims, like Osage rodeo star William Stepson, were poisoned.

Others simply vanished or were killed execution-style.

Even the dogs Osage people had bought to protect their homes were mysteriously dying.

Robert De Niro and Leonardo DiCaprio in “Killers of the Flower Moon”

Robert De Niro and Leonardo DiCaprio in “Killers of the Flower Moon”.Apple TV+

Four years later, little progress had been made.

One posed as an insurance salesman, another as a cattleman.

A third was an American-Indian agent who also went undercover.

Grann-book

Matthew Richman; Doubleday Publishing

On March 12, 1926, a preliminary hearing was held in Pawhuska, Okla. Hale would end up serving 18 years in Leavenworth, a federal prison in Kansas.

None other than Tom White, who came to greet Hale upon his arrival at the penitentiary.

He was paroled in 1947, as was John Ramsey.

CANNES, FRANCE - MAY 21: (L-R) Didier Allouch, Leonardo DiCaprio, Lily Gladstone, Director Martin Scorsese, Robert De Niro and Chief Standing Bear attend the “Killers of the Flower Moon” press conference at the 76th annual Cannes film festival at Palais des Festivals on May 21, 2023 in Cannes, France. (Photo by Stephane Cardinale - Corbis/Corbis via Getty Images)

Stephane Cardinale/getty

And most of them had escaped with zero accountability and millions in Osage wealth.