Boom! Boom! Boom! Boom! Boom! Boom! Boom! Boom! Boom! KABOOM! Bo had never heard anything like it before. Red and white dust was everywhere and big bits of the Wall crumbled away. ‘Holey terror!’ shouted Mr Buzz in Bo’s left ear. ‘Take cover!’ What would you do if your world was falling apart? Run, hide or try and save the day? The Holeys all live in a gigantic stone wall that is beginning to crumble and fall. They are frightened if the Wall falls what will become of their home? Bo is the youngest Holey. He is asked to go where no Holey has gone before, beyond the Wall. He must seek the mysterious Builder who the Holeys believe will save them. Bo discovers there is more to life than the Wall that houses them all. But what happens if Holeys don’t follow the rules? Well everyone follows the rules. Don't they?