by Alan MacDonald (Author). Calling all Dirty Bertie fans! Dirty Bertie - the boy with nose-pickingly disgusting habits - is back for another helping of comic chaos! With ever-increasing madcap schemes and crazy capers, Bertie continues to delight his legions of fans who revel in his revolting ways. Join Bertie as he turns Know-All Nick into a monster, gets stuck on a mountain with Dad and comes face to face with his French double!