Interesting details are here about the title: https://en.wikipedia.org/wiki/Black_Coal,_Thin_Ice
It doesn't give the whole plot.
"The project started from Diao Yinan's idea to film a detective story. Diao spent eight years in total to write the screenplay; the final version that was filmed was the third draft. The film was then laid out into a detective film noir."
I think that any noir fan will welcome and value this film.