There’s nothing like Martha’s Vineyard on crisp autumn days, after the season has ended. The “off-islanders” are finally gone and ex-Boston cop J.W. Jackson is free to relax. But the natives are getting seriously restless this fall, with animal rights activists squaring off against deer slayers and environmentalists butting heads with land developers. Things have reached a boiling point, and it’s not long before verbal arrows become real ones. When a most unlikely victim is caught in lethal crossfire, Jackson can’t just sit idly by.