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Quick answer: The best mystery Books for Kids 9-12 include The Westing Game by Ellen Raskin, From the Mixed-Up Files of Mrs. Basil E. Frankweiler by E.L. Konigsburg, Chasing Vermeer by Blue Balliett and twelve more picks chosen for story quality and age fit. Each book below has a short description, a suggested age range and who it suits best, with a comparison table to help you choose quickly.
Kids aged 9 to 12 love mysteries with puzzles, codes, secret clues and clever young detectives. These novels range from classic whodunits to modern puzzle adventures, and many are the first books in popular series.
Table of Contents
Quick Comparison Table
| Book | Author | Ages | Best for |
|---|---|---|---|
| The Westing Game | Ellen Raskin | 10-14 | puzzle fans |
| From the Mixed-Up Files of Mrs. Basil E. Frankweiler | E.L. Konigsburg | 9-12 | museum fans |
| Chasing Vermeer | Blue Balliett | 9-12 | art lovers |
| The Mysterious Benedict Society | Trenton Lee Stewart | 9-12 | fans of brain teasers |
| Greenglass House | Kate Milford | 10-13 | cozy mystery fans |
| Escape from Mr. Lemoncello's Library | Chris Grabenstein | 8-12 | game lovers |
| The London Eye Mystery | Siobhan Dowd | 9-12 | readers who like unusual detectives |
| The Name of This Book Is Secret | Pseudonymous Bosch | 9-12 | funny mystery fans |
| The Secret of the Old Clock | Carolyn Keene | 9-12 | classic mystery fans |
| The Tower Treasure | Franklin W. Dixon | 9-12 | fans of brother detectives |
| Murder Most Unladylike | Robin Stevens | 10-13 | boarding school fans |
| The Parker Inheritance | Varian Johnson | 10-13 | fans of The Westing Game |
| Book Scavenger | Jennifer Chambliss Bertman | 9-12 | book lovers |
| Three Times Lucky | Sheila Turnage | 10-13 | Southern mystery fans |
| When You Reach Me | Rebecca Stead | 10-13 | time travel fans |
How We Chose These Books
We looked for real, widely available titles that match the theme and the age range, and we favoured books with clear storytelling and strong reputations with parents, teachers and librarians. Age ranges are suggestions, not rules, so you know your reader best. Previewing a book before you hand it over is always a good idea, especially for sensitive topics.
The 15 Books
1. The Westing Game by Ellen Raskin
Sixteen heirs race to solve a millionaire's mysterious death. Recommended ages: about 10-14.
Best for: puzzle fans.
2. From the Mixed-Up Files of Mrs. Basil E. Frankweiler by E.L. Konigsburg
Claudia and Jamie hide in the Met and solve a mystery about a statue. Recommended ages: about 9-12.
Best for: museum fans.
3. Chasing Vermeer by Blue Balliett
Two classmates hunt for a stolen Vermeer painting. Recommended ages: about 9-12.
Best for: art lovers.
4. The Mysterious Benedict Society by Trenton Lee Stewart
Four gifted kids go undercover at a sinister school. Recommended ages: about 9-12.
Best for: fans of brain teasers.
5. Greenglass House by Kate Milford
Strange guests arrive at a smugglers' inn during a winter storm. Recommended ages: about 10-13.
Best for: cozy mystery fans.
6. Escape from Mr. Lemoncello's Library by Chris Grabenstein
Kids compete to escape a high-tech library. Recommended ages: about 8-12.
Best for: game lovers.
7. The London Eye Mystery by Siobhan Dowd
Ted and Kat work out how their cousin vanished from a Ferris wheel pod. Recommended ages: about 9-12.
Best for: readers who like unusual detectives.
8. The Name of This Book Is Secret by Pseudonymous Bosch
Two kids discover a secret society. Recommended ages: about 9-12.
Best for: funny mystery fans.
9. The Secret of the Old Clock by Carolyn Keene
Nancy Drew hunts for a missing will. Recommended ages: about 9-12.
Best for: classic mystery fans.
10. The Tower Treasure by Franklin W. Dixon
The Hardy Boys investigate a jewel theft. Recommended ages: about 9-12.
Best for: fans of brother detectives.
11. Murder Most Unladylike by Robin Stevens
Daisy and Hazel solve a murder at their school. Recommended ages: about 10-13.
Best for: boarding school fans.
12. The Parker Inheritance by Varian Johnson
Candice follows clues to a hidden fortune and a town's history. Recommended ages: about 10-13.
Best for: fans of The Westing Game.
13. Book Scavenger by Jennifer Chambliss Bertman
Emily hunts for hidden books and a dangerous secret. Recommended ages: about 9-12.
Best for: book lovers.
14. Three Times Lucky by Sheila Turnage
Mo LoBeau investigates a murder in her small town. Recommended ages: about 10-13.
Best for: southern mystery fans.
15. When You Reach Me by Rebecca Stead
Miranda receives mysterious notes. Recommended ages: about 10-13.
Best for: time travel fans.
How to Choose the Right Book
For classic mysteries, start with The Westing Game, Nancy Drew or The Hardy Boys. Puzzle lovers should try The Mysterious Benedict Society, Escape from Mr. Lemoncello's Library and Book Scavenger. For mysteries with heart, The London Eye Mystery, Three Times Lucky and When You Reach Me are excellent.
Tips for Choosing and Sharing These Books
- Read it first. A quick skim lets you spot anything that might need a conversation.
- Match the book to the child. A reader who loves jokes may prefer a funny pick, while a quiet reader may prefer a gentler story.
- Read together. Pausing to ask what a character might feel or do next turns a story into a conversation.
- Visit the library. Borrowing a few titles from this list lets you find the ones your child returns to.
- Revisit favourites. Children often ask for the same book again and again, and rereading builds confidence.
Frequently Asked Questions
What is the best book on this list to start with?
The Westing Game by Ellen Raskin is a strong place to start, and every book on this list is a good option.
What age are these books for?
The books on this list suit roughly ages 8 to 14, and each entry shows its own suggested range.
Should I read these books aloud?
Many of them work well read aloud, especially with younger children, and older readers may enjoy reading them independently.
Where can I find these books?
Most of these titles are easy to find at public libraries, school libraries and bookshops, and many are available as ebooks or audiobooks, which can help reluctant or struggling readers.