And that's the Secret of the Christmas Box - that the ornaments come alive once a year for the time they're on the tree.
Larry the snowman ornament and his friends set out to find his missing brother. Joined by various other ornaments and foiled by some evil lights, this makes for an entertaining Christmas tale. It actually has twenty four chapters and would make a great lead up to Christmas read with young ones.
The book is listed as being for reading level 8-12. I think that 10-12 year olds may find the story a bit juvenile, especially as the children in the story are 5 and 7. Some of the phrases used may be a bit dated or specific to country ( Hornby hails from Britain) such as 'guts for garters'.
Hornby is an award winning animator originally planned for "Secrets" as a screenplay. I think it would make an excellent animated tale, perhaps more so than a book.