Fans of FX’s critically acclaimed three-season series “Reservation Dogs” saw firsthand how much creator Sterlin Harjo revered the art of cinema. Episodes would often contain nods to various genres and films; the series finale was even an homage to Robert Altman’s “Nashville.”

So, it’s no surprise that when Harjo set out to create his follow-up to “Rez Dogs,” he decided to tackle another one of his favorite film styles: Noir. “ The Lowdown ,” which premieres Sept. 23 on FX, stars Ethan Hawke as citizen journalist Lee Raybon, who calls himself a “truthstorian” while investigating the seedy underbelly of Tulsa, Okla.

“I just am such a fan of noir,” says Harjo, who exec produces “The Lowdown” in addition to writing and directing the pilot. “And I just had always thought that I could se

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