[chesimov]

There was a recent Icelandic (I think) TV show with a premise along these lines

[stickfigure]

https://en.wikipedia.org/wiki/Fortitude_(TV_series)

Filmed in Iceland, set in Norway. Slow paced but quite excellent.

(S2 was not as good as S1, however)

[hexane360]

Also an X-Files episode: https://en.wikipedia.org/wiki/Darkness_Falls_(The_X-Files)