The Grunions' house had many doors. But there was one door, that had never been opened before! The door that had never been opened before was built closed shut, locked tight, and never opened for a reason. A reason that nobody knew. Geraldine opened every door she ever found. Geraldine opened every door and went everywhere and met everyone and did everything. Everything, except one thing. Geraldine had never opened the Door that had never been opened...