Whittock feels like somewhere where dark mysteries would live, buried in its dense forests and obscured by ash-gray fog. The fictional British Columbia setting of the new Crave series “Yaga,” premiering Friday on AMC+, is the type of place that makes you believe in those very old stories of witches and sacrifices and deals with the devil. Unfortunately, it’s also the strongest ingredient in “Yaga,” an otherwise poorly mixed brew of sex, horror and mystery that’s not particularly sexy, scary or mysterious.

It’s a shame, too, because all the pieces for something worthwhile are here. Adapting Kat Sandler’s 2019 play of the same name (Sandler is also the show’s writer, showrunner and executive producer), the story is a reimagining of the legend of Baba Yaga, a complicated, intriguing character in Slavic folklore who sometimes helps the hero — and sometimes eats children.…