So Cold the River is a 2022 horror film that was written and directed by Paul Shoulberg.
Erica is a documentary filmmaker who gave up on her career after one of her prior subjects did something unspeakable.
She's persuaded to once again return to this field by Alyssa, the daughter of dying and mysterious billionaire Campbell Bradford.
She is tasked with profiling his life, including his ties to his hometown, but Erica is given few clues as to his past other than a bottle of water from a local spring.
Erica travels to a resort he once frequented, where she discovers that Campbell is tied to a dark, disturbing history full of evil.