The war satire "Atropia" about actors in a military role-playing facility won the grand jury prize in the Sundance Film Festival's U.S. dramatic competition, while the Dylan O'Brien movie "Twinless" got the coveted audience award.

The penultimate edition in its long-running Park City location, the Sundance Film Festival began today, and, as I note every year, the event is a bellwether when it comes to an assessment of the American independent film scene.