Late on Sept. 21, 1996, searchers found the body of 15-year-old Danielle "Danni" Houchins in a swampy area along the Gallatin River, a scenic valley just outside Bozeman, Montana. Exactly what had happened to Danni -- and how she had ended up face down in the mud -- would mystify her family, friends and investigators for decades.

The case, and its stunning conclusion, is investigated by "48 Hours" and correspondent Peter Van Sant in "It's About Danni." An encore of the broadcast airs Saturday, Dec. 6 at 9/8c on CBS and streaming on Paramount+.

Back in 1996, Rachelle Schrute, now the Hunt & Fish editor at GearJunkie , knew both Danni and her sister Stephanie. She recalled, "They were the most down-to-earth, friendly people." Stephanie Mollet told Van Sant that there had been a

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