"Score is from New York. Helaine is from the medieval world Ordin. Pixel is from virtual reality on the world Calomir. All three are kidnapped and taken to an alien planet. Here they discover they possess magical abilities that need to be trained. They also find that someone is trying to kill them."

Originally published as part of Scholastic books, Diadem is a fantastic series about three friends traveling across dimensions in search of the truth behind the universe, and their own place in it all. The author encourages the reader to try to solve puzzles along with the characters as they traverse from one planet of the Diadem to another and includes many interesting twists on 'normal' fantasy and science fiction themes and creatures.

The first six books in the series were published consecutively in 1997, then re-published by Llewellyn in 2004. the next four were published by Llewellyn starting in 2004, and the remaining two were published by Dragonhome Books in 2012:

1. Book of Names
   
2. Book of Signs
   
3. Book of Magic
   
4. Book of Thunder
   
5. Book of Earth
   
6. Book of Nightmares
   
7. Book of War
   
8. Book of Oceans
   
9. Book of Reality
   
10. Book of Doom
    
11. Book of Time
    
12. Book of Games