할아버지 ‘에드’에게 방을 뺏겨 다락방 신세가 된 손자 ‘피터’.
방을 되찾기 위해 할아버지를 골탕 먹이려 하지만 호락호락하지 않다.
계속되는 ‘피터’의 도발에 ‘에드’의 반격이 시작되고,
방을 사수하기 위한 소리 없는 전쟁이 시작되는데…!
룰도, 나이도 없다! 과연 승자는 누구?!
Peter is thrilled that Grandpa is coming to live with his family. That is, until Grandpa moves into Peter's room, forcing him upstairs into the creepy attic. And though he loves his grandpa he wants his room back - so he has no choice but to declare war. With the help of his friends, Peter devises outrageous plans to make Grandpa surrender the room. But Grandpa is tougher than he looks. Rather than give in, Grandpa plans to get even.