See Reba McEntire and boyfriend Rex Linn in the new 'Big Sky' trailer

Reba McEntire and Rex Linn play backcountry outfitters with a dark secret in the official trailer for "Big Sky" season 3.

McEntire and Linn, who have been dating since 2020, play Sunny and Buck Barnes, co-owners of glamping company Sunny Day Excursions, which runs hunting trips in a small Montana town -- but there's more than meets the eye and fans just might find the "Fancy" singer in her most sinister role to date.

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The new trailer, set to Patsy Cline's "Walking After Midnight," follows private detective Cassie Dewell (Kylie Bunbury), undersheriff Jenny Hoyt (Katheryn Winnick) and newly appointed Sheriff Beau Arlen (Jensen Ackles) as they head out to the woods to check out a mystery, leading them to the Barneses.

"The trio faces their most formidable mystery yet -- in which no camper can be trusted and where danger lurks around every jagged rock and gnarled tree," the show's official synopsis reads.

"Big Sky" is based on the C.J. Box book series "The Highway." The third season of the page-to-screen adaptation is subtitled "Deadly Trails."

Season 3 of "Big Sky" kicks off Sept. 21 on ABC.