Quick answer
A first edition of Mercy Watson: Princess in Disguise (Mercy Watson 4) by Kate DiCamillo (Candlewick Press, 2007) is identified by: Fourth title in the Mercy Watson series, illustrated by Chris Van Dusen. US Candlewick edition is the true first (2007).
Checklist — a true first has these:
- Fourth title in the Mercy Watson series, illustrated by Chris Van Dusen
- Candlewick, 2007
- First printing shows a complete number line ending in 1 on the copyright page
- Issued in pictorial hardcover boards without a dust jacket, as issued
- Publisher imprint reads Candlewick Press
- Not a book-club edition (see below)
| Author | Kate DiCamillo |
|---|---|
| Publisher | Candlewick Press |
| Year | 2007 |
| True first | US edition |
| Format | Children's / illustrated |
| Key point | Fourth title in the Mercy Watson series, illustrated by Chris Van Dusen |
| Book-club edition exists? | — |
The points of issue
- Fourth title in the Mercy Watson series, illustrated by Chris Van Dusen
- Candlewick, 2007
- First printing shows a complete number line ending in 1 on the copyright page
- Issued in pictorial hardcover boards without a dust jacket, as issued
How Candlewick Press marked a first edition
- Full descending number line on copyright page; first printing ends in 1 (e.g. 10 9 8 7 6 5 4 3 2 1) — the number-line position of '1' is the authoritative first-printing signal
- Often states 'First edition' or 'First U.S. edition' on the copyright page (Candlewick is the US arm of UK Walker Books, so many titles are 'First U.S. edition' of a prior UK Walker printing)
Full Candlewick Press first-edition guide →
How to verify your copy, step by step
- Find the copyright page — the verso (back) of the title page.
- Confirm the first-edition statement — look for “First Edition,” “First Printing,” or the publisher’s equivalent wording.
- Read the number line — the lowest number is the printing. A line including 1 is a first printing (Random House deliberately ends at 2). Paste it into the decoder.
- Verify this is the US true first — not a later-market or reprint edition.
- Rule out a book-club edition — a blind-stamp on the rear board or a jacket with no printed price marks a book-club copy.
- Photograph four things — the front cover, spine, title page, and copyright page — the standard record for identification.
The dust jacket
For a collectible first edition the dust jacket matters as much as the book. Confirm the jacket is present and unclipped — the printed price should still be at the corner of the flap (a clipped corner or a price-less flap can indicate a book-club issue). First-state jackets can differ from later ones in the cover art, blurbs, or review quotations; where a specific first-state jacket point is known for this title it is noted above.
Binding & format
Where multiple bindings exist, the hardcover trade issue is usually (but not always) the precedence copy — confirm against the points above. Later printings often show cheaper cloth, thinner boards, or simplified spine stamping. A simultaneous signed or limited issue, when one exists, is a distinct state from the trade first.
Is this the true first?
US Candlewick edition is the true first (2007). US author and US publisher, so no competing UK or Canadian precedence.
Telling it from reprints & book-club editions
Later printings advance the number line so the sequence no longer ends in 1.
Frequently asked questions
Is my copy of Mercy Watson: Princess in Disguise (Mercy Watson 4) a first edition?
A first edition of Mercy Watson: Princess in Disguise (Mercy Watson 4) by Kate DiCamillo (Candlewick Press) is identified by: Fourth title in the Mercy Watson series, illustrated by Chris Van Dusen.
How do I tell the first printing from a later one?
Check the copyright page. A number line whose lowest number is 1 marks a first printing (Random House ends at 2). US Candlewick edition is the true first (2007).
Is the book-club edition the same as the first?
Later printings advance the number line so the sequence no longer ends in 1.
I have a first edition of Mercy Watson: Princess in Disguise (Mercy Watson 4) — what should I do?
If you are clearing books in the Albuquerque area, the New Mexico Literacy Project offers free pickup, any condition, and makes sure collectible copies are identified rather than lost. To sell, see the author’s collecting guide. Either way, nothing collectible ends up in a landfill.
Glossary
- First edition
- Every copy printed from the first setting of type. Collectors usually want the first edition, first printing (the true first).
- First printing / impression
- A single press run from that setting. The first printing is the earliest and most desirable; later printings are still the first edition but not the true first.
- Number line (printer's key)
- A row of numbers on the copyright page (e.g. 10 9 8 7 6 5 4 3 2 1). The lowest number present is the printing — a line including 1 marks a first printing (Random House deliberately ends at 2).
- Points of issue
- Specific physical details — a stated edition, a number line, a typo, a jacket state — that identify the true first printing.
- Book-club edition (BCE)
- A reprint made for a book club. Tells include a blind-stamped dot or square on the rear board and a dust jacket with no printed price. Not the true first.
- First thus
- The first appearance of a particular version (first paperback, first illustrated, first U.S. printing) — a first of that kind, not the first edition of the work.
Related first editions
How to cite this page
New Mexico Literacy Project. “Is Mercy Watson: Princess in Disguise (Mercy Watson 4) by Kate DiCamillo a First Edition? Points of Issue.” NMLP First-Edition Identification Reference. Reviewed 3 July 2026. Retrieved from https://newmexicoliteracyproject.org/first-edition/mercy-watson-princess-in-disguise-mercy-watson-4. Licensed CC BY 4.0 — part of the open Canonical First-Edition Points of Issue dataset.