Look inside! 5 Worlds Book 2: The Cobalt Prince Author Mark Siegel Author Alexis Siegel Illustrated by Xanthe Bouma Illustrated by Matt Rockefeller Illustrated by Boya Sun Buy! 5 Worlds Book 2: The Cobalt Prince select book format Paperback Ebook Amazon Barnes & Noble Books A Million Bookshop.org Hudson Booksellers Powell's Target Walmart Amazon Apple Books Barnes & Noble Books A Million Google Play Kobo For Ages 8 to – 12 5 Worlds Book 2: The Cobalt Prince is a part of the 5 Worlds collection. Under the Cover