In 1921, two murder victims were discovered on the same day in Osage County in northeastern Oklahoma. It was shocking news, but members of the Osage tribe already knew they were in danger. They were some of the richest people on Earth, thanks to the oil under their land, and they had been dying in mysterious ways for years. But when the two bodies were found on the same day, it launched a 5-year period known as the Reign of Terror. No one was safe, and no one could be trusted.

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