THE DARK TOWER (M) Looms large, lingers little, US, 95 min
Following the plot of this shapeshifting, multiworld fantasy (based on the eight-book series by Stephen King) is a difficult prospect indeed. Best focus instead on the two most prominent players here. Idris Elba is Roland (aka The Gunslinger), the pistol-wielding guardian of a tower that keeps an ever-imminent plague of demons at bay. Matthew McConaughey is Walter (aka The Man in Black), a slick sorcerer doing whatever it takes to hasten a demondriven apocalypse.