Williams and Joachim ran as fast as they could through the tunnels that led up to the surface. Williams tucked in behind the boy and stayed out of his way – the last thing they needed was to trip each other up and lose time, or alert their pursuers. Although the tunnels were quiet, neither could shake off the feeling that something was coming after them, fast. The boy seemed to know every inch of the tunnels; how long he’d spent searching them all was anybody’s guess. This knowledge was what was going to save them, thought Williams, or at least give them a fighting chance.
Ghosts don’t get out of puff, which both surprised and motivated Williams. He’d always found a way to get out of the Met’s annual fitness test, because he knew that he was too many sausage rolls down the wrong track to
