M. Night Shyamalan is the writer-director behind the likes of The Sixth Sense, Unbreakable, Glass, Signs, The Village, Split, The Visit and now the efficiently-named "Old", a horror-thriller that almost defies description. A group of holidaymakers are taken to a mysterious private beach where they soon start to notice that they're aging at an alarming rate: children become teenagers, then young adults, over the matter of hours. Horrifying, right? You bet. Listen here to Ali talking to the man himself about where the idea came from and the practicalities of shooting on a beach in the Dominican Republic for days on end...