Knights of the Borrowed Dark (Knights of the Borrowed Dark Book 1) : Paperback : Penguin Random House Children\'s UK : 9780141356600 : : 07 Apr 2016 : Grey placed his finger in the middle of the shadow. \'What\'s this?\' he asked. Denizen frowned. \'It\'s a shadow.\' \'No, it isn\'t,\' Grey said. \'It\'s a door.\' Denizen Hardwick doesn\'t believe in magic - until he\'s ambushed by a monster created from shadows and sees it destroyed by a word made of sunlight.