Despite a terrific concept, a striking setting and some pretty nifty special effects here and there, this killer-mermaid show never really comes together. Maybe it’s

Despite a terrific concept, a striking setting and some pretty nifty special effects here and there, this killer-mermaid show never really comes together. Maybe it’s
Like 2016’s “Blair Witch,” “Rings” tries to have its cake and eat it too: It’s both a sequel to and remake of 2002’s “The Ring,”