Detective Thingy Majiggy
Mia can talk to everyday objects, and they talk back, which makes her a very useful new detective.
Detective Thingy Majiggy is a mystery title by Cecelia Ahern, illustrated by Katie Saunders. In the children’s bestseller list we checked on 7 November 2026, it was number 18. This guide explains what the book is about, who it suits, how to talk about it and what to read next.
What is Detective Thingy Majiggy about?
Ten-year-old Mia moves into a new foster home with Detective Lucy. She has a special gift: she can talk to everyday objects, and they talk back. With their help she investigates mysteries, including how a fire started in her new classroom.
The book has black-and-white illustrations throughout by Katie Saunders and is the start of a new series.
Detective Thingy Majiggy: book details
| Detail | Information |
|---|---|
| Author | Cecelia Ahern |
| Illustrator | Katie Saunders |
| Series | Detective Thingy Majiggy (book 1) |
| Format | Paperback |
| Publisher | HarperCollins Children’s Books |
| Genre | Mystery |
| Age guide | 7 to 9 |
| ISBN (edition listed) | 9780008792626 |
Ages marked as “suggested” are our own guidance, not the publisher’s. Editions and dates can differ between shops, so check the listing for the copy you want.
Why children enjoy Detective Thingy Majiggy
- Talking objects make it playful and imaginative.
- A gentle mystery format with short chapters and illustrations suits newer readers.
- A foster-care setting gives a quietly warm view of finding a home.
Reading and talking tips
Use these prompts to make reading time a conversation:
- Ask: “Which object in our house would be the best witness?”
- Invent a clue for your child to solve using household items.
- Talk about how Mia might feel in a new place.
An Irish connection
This title has an Irish link through its author, setting or subject, which makes it a good fit for our collection of Irish children’s authors and illustrators.
About Cecelia Ahern
Cecelia Ahern is an Irish author best known for adult novels such as P.S. I Love You. Detective Thingy Majiggy marks the start of her series for young readers.
Read more on our Cecelia Ahern author page.
If your child likes this, try…
- Rabbit and Bear: The Bog of Frogs by Julian Gough, number 14 in the list.
- Milly McCarthy and the Doggy Daycare Drama by Leona Forde, number 9 in the list.
- Ghost and Toast: Slice to Meet You! by Phil Corbett, number 10 in the list.
Browse the whole list in our Top 20 children’s books, or use our books by age guides to find your next read.
Frequently asked questions about Detective Thingy Majiggy
What age is Detective Thingy Majiggy for?
The publisher gives 7 and up and lists ages 7 to 9.
Who is Cecelia Ahern?
She is an Irish author known for adult novels such as P.S. I Love You.
Is it a series?
Yes. It is book 1 in the Detective Thingy Majiggy series.
Where to find it: your local library, an independent bookshop or an online retailer. Library membership is free in Ireland; see our guide to using your library.