Join Bertie in three hilarious new stories as he faces a barrage of footballs as the school's new goalie, battles to stay clean for the school photographer and has a spookily terrifying sleepover! Meet Dirty Bertie - world's grubbiest trouble magnet! Join Bertie in three hilarious new stories as he faces a barrage of footballs as the school's new goalie, battles to stay clean for the school photographer and has a spookily terrifying sleepover!