" When he gets back to the station, Nelson laboriously Googles ‘the twitch upon the thread’ and comes up with a quotation from G.K. Chesterton: ‘I caught him, with an unseen hook and an invisible line which is long enough to let him wander to the ends of the world, and still to bring him back with a twitch upon the thread.’ ‘Bollocks,’ says Nelson, switching off the computer. "

― Elly Griffiths , The Janus Stone