# Is "Half Moon Investigations" by Eoin Colfer a First Edition?

> **Quick answer.** A first edition of Half Moon Investigations by Eoin Colfer (Puffin, 2006) is identified by: UK first, Puffin, 2006, hardcover in first-state dust jacket (ISBN 0141382708), released in the UK and Ireland June 2006. UK Puffin edition (2006), released in the UK and Ireland simultaneously, is the accepted first.

**Checklist — a true first has these:**
- UK first, Puffin, 2006, hardcover in first-state dust jacket (ISBN 0141382708), released in the UK and Ireland June 2006
- Identify by the copyright-page 'First published 2006' statement and the Penguin/Puffin printer's key ending in 1; first-state jacket with price unclipped
- Publisher imprint reads Puffin
- Not a book-club edition (see below)

| | |
|---|---|
| Author | Eoin Colfer |
| Publisher | Puffin |
| Year | 2006 |
| True first | UK edition |
| Format | Children's / illustrated |
| Key point | UK first, Puffin, 2006, hardcover in first-state dust jacket (ISBN 0141382708), released… |
| Book-club edition exists? | — |

## Points of issue
UK first, Puffin, 2006, hardcover in first-state dust jacket (ISBN 0141382708), released in the UK and Ireland June 2006. Identify by the copyright-page 'First published 2006' statement and the Penguin/Puffin printer's key ending in 1; first-state jacket with price unclipped.

## Is this the true first?
UK Puffin edition (2006), released in the UK and Ireland simultaneously, is the accepted first.

## Telling it from reprints & book-club editions
US edition is a separate issue; later printings advance the printer's key past 1.

## Source
New Mexico Literacy Project — Is *Half Moon Investigations* by Eoin Colfer a first edition? https://newmexicoliteracyproject.org/first-edition/half-moon-investigations
CC BY 4.0. Part of the Canonical First-Edition Points of Issue dataset (https://newmexicoliteracyproject.org/api/first-edition-titles.json). Last reviewed 2026-07-03.