Sybilla Peale lives with her large, artistic family at America's first museum, in Philadelphia. Life in a museum is full of adventure but also hard work! One day, Sybilla helps her papa and her big brother Rembrandt assemble the bones of a magnificent mastodon. She starts visiting her fossilized friend for regular tea parties and chats. But then her mastodon is invited to tour Europe, and she is heartbroken. Will Sybilla be content to share her best friend with the world?

From the dust jacket