Beneath a thin layer of dust, I recognised Pa's loopy handwriting. I blew the dust from the pages, revealing directions and a roughly sketched map. At the bottom of the page was a single line - 'COME ALONE' it read, in large letters. A gust of wind carried along the back corridor. There had to be an exit somewhere further down. I shone the torch down the passage, where a wall kinked the passage in another direction. I picked up the book and started walking.