Probably inspired by a swathe of similarly themed movies, this is a fairly run of the mill drama about a stereotypically off-beat group determined to bring down a corporation that treats the local ecology with scent regard. Brit Marling - who has involvement on both sides of the camera - is "Sarah" an agent tasked with infiltrating this group. The more she mixes with them, understands them and their views and priorities, the more she begins to feel emotionally and professionally compromised - especially as there appears ample evidence that at least one of their target organisations is as…