I just put in "Shadow World" on E-Bay looking for some modules and prices and spotted "Shadow World: The Eidolon Chronicles" by Jane Johnson
http://cgi.ebay.com/NEW-The-Shadow-World_W0QQitemZ180264198400QQihZ008QQcategoryZ279QQssPageNameZWDVWQQrdZ1QQcmdZ
ViewItem#ebayphotohosting
Terry - has Jane gotten permission from you to use your ideas? Then again, from reading the synopsis (Twelve-year-old Ben Arnold returns to the magical world of Eidolon to rescue his sister Ellie and help their mother battle the vile Dodman, whose power continues to grow.), she might have only cribbed some of your most basic concepts and descriptions. And this is the second book in the series... Maybe she gave you credit in the acknowledgements.