When the dangerous ancient wizard Arkwright escapes the dungeon and goes missing within the Castle, Princess Celie must find the wizard and save her family.
Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.
This book describes the castles of the Middle Ages, presenting information on feudalism, the construction of a castle, castle defenses, castle life, and attacks on castles.
"Anticipating a dreadful summer alone, young Alfie Bloom unexpectedly inherits a castle which conceals a centuries-old, dangerous secret that threatens everyone who lives within one thousand miles"--OCLC.