Cast a cursor about on any book sales web page these days and you’ll invariably land somewhere near to a parallel universe novel. They’ll promise to take you on journeys far and wide, stretching the limits of your imagination. One may explore a world where Nazi’s won WWII (The Man in the High Castle-Philip K Dick) others make use of invented contraptions to slip between worlds, such as Blake Crouch’s Dark Matter. To the fiction weary, they yield reviews of ‘ridiculous premise