Book Details

Harper Collins Logo

To read e-books on the HC Reader App, download it on:

Agatha Oddly

The Secret Key (Agatha Oddly, Book 1)

About the Book

Meet thirteen-year-old Agatha Oddly – a bold, determined heroine, and the star of a stylish new detective series.

Agatha attends prestigious St Regis Grammar School, has an eye for all things vintage, lives in Hyde Park, London, and has wanted to be a detective for as long as she can remember. She’s just waiting for her first Big Case…

And nothing gets bigger than saving the city of London from a deadly red slime. Agatha teams up with Liam – her best friend and partner in crime – determined to solve the mystery.

For Agatha, no case is too odd…

Educator and Librarian Resources

Product Details

  • ISBN: 9780008211844
  • ISBN 10: 0008211841
  • Imprint: HarperCollinsChildren’sBooks
  • On Sale: 06/28/2018
  • Pages: 320
  • List Price: 10.99 CAD
  • BISAC1: JUVENILE FICTION / Mysteries & Detective Stories
  • BISAC2: JUVENILE FICTION / Girls & Women

The Secret Key (Agatha Oddly, Book 1) by Lena Jones

The broadest selection of online bookstores. The links will take you to the web site's home page.

Other Booksellers

The broadest selection of online bookstores. The links will take you to the Web site's home page.


International Customers

If you are located outside Canada, the best way to order online is to choose from the following bookstores listed by region and country.

HarperCollins Reader

We created the HC Reader App to be a simple way to read our e-books. Our App is available for download on iOS and Android devices.

We strongly encourage using the HarperCollins reader application since it supports the type of file we are using. You may experience some technical difficulties using a different reader application.


  1. You need a HarperCollins Account. If you purchase/have purchased an e-book from HarperCollins, this is your account login and password. If not, please click here to register.
  2. Download the HC Reader App on iOS or Android. Enter your HarperCollins account username and password. Please note that your username is an e-mail address.
  3. Download your e-book and enjoy!