Igraine lives in an old castle with her family, magicians who possess powerful books of magic.

On her 12th birthday, Igraine's parents give her a magical suit of armor, but in the process, they are turned into pigs by mistake.

Matters get worse when the next-door Baroness's castle is taken over by Osmond the Greedy, who wants to take the magical books so he can overthrow the king.

Igraine and her brother must find a way to defend the castle from Osmond's siege while keeping their parents' condition secret and searching for the missing ingredient for their restoration to human form.

Albert handles the castle's magical defenses while Igraine leaves to find the missing ingredient.