We suddenly live in an indie horror renaissance, where skilled and richly thought-through scarefests, most notably “It Follows,” actually cross over into the mainstream. Jennifer Kent’s Australian ghost movie never cracked the national top ten box office winners this past winter, but it’s equally intense. In fact, it’s debatably more neve-wracking before a mega-creepy specter out of a demented children’s book starts skulking about the creaky home of a widow (Essie Davis) and her young son (Noah Wiseman). That’s because he’s become abruptly unhinged, so convinced there's a ghoul in the house that he’s taken to massive, loud, uncontrollable freak-out sessions, much to the dismay of his grieving and already on-edge mom. He works on viewer’s nerves to so that once things go next level they’re already frayed.