The Valentine Manor is a very large estate that was built by the brilliant and wealthy writer Edgar Valentine. He built secret passages and caches for his daughters. Unfortunately, Edgar passed away earlier than expected when he was involved in an airline crash. Rosalyn Valentine is a very artistic girl who loves painting, singing, drawing, and violin. Amelia is a scientific girl who loves chess, logic, science, chemistry, and math. They can't let the authorities know they live here alone.