Home Random House Children's Books Home Menu 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 Hardcover Ebook Amazon Barnes & Noble Books A Million Bookshop.org Hudson Booksellers IndieBound Powell's Target Walmart Amazon Barnes & Noble Books A Million Bookshop.org Hudson Booksellers IndieBound Powell's Target Walmart Amazon Apple Books Barnes & Noble Books A Million Google Play Store Kobo Home Random House Children's Books Home Menu For Ages 8 to – 12 5 Worlds Book 2: The Cobalt Prince is a part of the 5 Worlds collection. Home Random House Children's Books Home Menu Under the Cover