What Katy Did
- Series: Helbling Readers Red Series, Helbling Readers Red Series Classics
- Series Level: Level 3
- Adapter: Geraldine Sweeney
- Illustrator: Francesca Galmozzi
- School Type: Lower Secondary
- Language Level: CEFR A2
- Components: Reader, Media App, e-zone resources
- Details: 84 pages, Softcover, 148 x 210 x 4.31 mm
- ISBN: 978-3-7114-0117-5