You could also read 'Children of Santa', which takes place in the middle of this story.
More information and links to my other books can be found at www.rabiddrown.com

Amelia draws herself into her magical pad and goes missing!
Meanwhile Greg is cooking up another plan to get hold of the magical stationery set.
And, while all of this is going on, Finola is trying to decide whether she really does want to be Amelia's best friend.