The real life figure of Ed Gein looms large in horror films and literature. Most famously he was the direct inspiration for Norman Bates in Psycho and his terrible influence can also be found haunting The Texas Chainsaw Massacre and Silence Of the Lambs. But I’m not sure his real story has been told quite so directly as it is in Under The Floorboards which played live at the Edinburgh Fringe and has now emerged as an online performance film at this year’s Festival.