“Pearl” (*1/2 out of four) was a drably done horror melodrama set in 1918 showing the back-story of Pearl (Mia Goth) and how she grew up in an isolated farmhouse under the domineering hand of her strict mother and how she yearned for a glamorous life like she’s seen in the movies and how her ambitions, temptations, and repressions drove her to an insane state of murder. Yet another unnecessary horror follow-up- this is actually a prequel to last year’s “X” although the movie it might remind you most of is M. Night Shymalan’s “The Village.” Either way, it’s snail-paced and glum. Goth’s bravura performance is film’s only asset.