Osgood Perkins is back with yet another horror movie this month. But is his latest streaming? “Longlegs” and “The Monkey” filmmaker Osgood Perkins returned Friday with yet another horror movie — this time, a folk horror called “Keeper” starring Tatiana Maslany and Rossif Sutherland. Fans of Perkins’ will be happy to know that they can once again watch a spooky and disturbing film from the rising voice in the horror genre. But where can you watch Perkins’ latest, and is “Keeper” out on streaming?