‘Cusp’ Review (Sundance)

Constructed with a spirit of take-life-as-it-comes open-endedness that feels both invigorating and dangerous, “Cusp” becomes a documentary about three young girls trying to avoid being defined by the boys and men in their lives. Its ultimate accomplishment is that we absolutely come to believe they can, as well as triumph over so much more, despite the tensions lurking in the underbrush of teenage ennui.