Two years ago, filmmaker Jeremy Saulnier brought a little movie called 
Blue Ruin to Directors' Fortnight at Cannes. It was a hit, soon making its way to U.S. theaters. Now, Saulnier returns to the section with 
Green Room, which pits a punk band against a scary group of skinheads (including one played by Patrick Stewart). Not nearly as nuanced as 
Blue Ruin, 
Green Room is straight-up B-movie pulp. It's pretty well done, as I explain in my 
Screen International review.