The points of issue
YA science fiction. US Eos (HarperCollins) hardcover 2007; copyright page states First Edition with a complete number line including 1. Caution: some copies state First Edition but carry a number line starting at 2 -- those are later printings. Black boards with gilt spine lettering, black endpapers.
Is this the true first?
US Eos hardcover is the true first; a stated First Edition alone is not sufficient -- the number line must reach 1.
Telling it from reprints & book-club editions
Later printings retain the First Edition statement but the number line lacks a 1.
Frequently asked questions
Is my copy of Interworld (with Michael Reaves) a first edition?
Look for these first-edition points: YA science fiction. US Eos (HarperCollins) hardcover 2007; copyright page states First Edition with a complete number line including 1. Caution: some copies state First Edition but carry a number line starting at 2 -- those are later printings. Black boards with gilt spine lettering, black endpapers.
How do I tell the first printing from a later one?
Check the copyright page for the publisher's first-printing convention and confirm the points above. US Eos hardcover is the true first; a stated First Edition alone is not sufficient -- the number line must reach 1.
Is the book-club edition the same as the first?
Later printings retain the First Edition statement but the number line lacks a 1.
I have a first edition of Interworld (with Michael Reaves) — what should I do?
If you're clearing books, New Mexico Literacy Project offers free pickup in Albuquerque, any condition, and makes sure collectible copies aren't lost. To sell, see the author's collecting guide. Either way, nothing valuable ends up in a landfill.