UK 
Mr. Poirot and Little Miss Marple
Two more Mr. Men Little Miss X Agatha Christie stories have been announced
Introducing Little Miss Marple: Bump in the Library and Mr. Poirot: Mystery on the Opulent Express
Mr. Poirot: Mystery on the Opulent Express
Hardback
Mr. Poirot is travelling on the Opulent Express to Paris, where his fellow passengers include the wealthy business tycoon Mr Rude and other intriguing passengers such as Madame Magic, Colonel Impossible and Professor Inventor.
So, when there appears to be a thief onboard the train, it is time for Mr Poirot to use his little grey cells to investigate this seemingly impossible mystery.
RRP: £9.99
Little Miss Marple: Bump in the Library
Hardback
Little Miss Marple is staying at Gossipton Hall when Sir Jelly finds a body in the library! This turns out to be a confused Major Bump, with a bump on his head. With growing uncertainty about whether this was accidental, Little Miss Marple joins Major Bump on a trip to the Majestic Hotel, where there is much suspicion about his fellow holidaymakers.
Can Little Miss Marple help Inspector Nonsense and Constable Silly find the culprit?
RRP: £9.99
Explore the Stories
Mr. Poirot: Mischief on the Nile
Hardback
Mr. Poirot is escaping the winter gloom with a sunny cruise on the River Nile when he meets his friend Colonel Rush, who travels the world tracking down criminals. His relaxing holiday soon includes much mischief and a mystery to solve, with many Mr. Men and Little Miss suspects, including Mr. Tickle with his extraordinarily long arms! Can Mr. Poirot use his little grey cells to solve this most mischievous mystery?
RRP: £9.99
Little Miss Marple: Muddle at the Vicarage
Hardback
Little Miss Marple lives St Mary Mead, where she counts Mr. Nosey and Little Miss Chatterbox among her friends and she herself just takes a keen interest in the goings on in the village! So, when Reverend Muddle suspects there’s been a theft at the vicarage, and there are further mysteries of the rather muddled kind, Little Miss Marple is sure she can help Inspector Nonsense and Constable Silly uncover the truth…
RRP: £9.99
Discover Mr. Poirot and Little Miss Marple Activities
Mr. Poirot: A Puzzle
Piece together a page from Mr. Poirot: Mischief on the Nile with this digital jigsaw
How to Draw Mr. Poirot with Adam Hargreaves
Learn how to draw Mr. Poirot with Adam Hargreaves
Little Miss Marple: A Puzzle
Piece together a page from Little Miss Marple: Muddle at the Vicarage with this digital jigsaw
How to Draw Little Miss Marple with Adam Hargreaves
Learn how to draw Little Miss Marple with Adam Hargreaves
Mr. Poirot and Little Miss Marple: Colouring Sheets
Put your creativity to work with the Mr. Poirot and Little Miss Marple colouring sheets
Mr. Poirot and Little Miss Marple: A Word Search
Find words and phrases associated with Mr. Poirot and Little Miss Marple in this word search
Discover more printable activities on the Mr. Men website
Explore morePreviously Announced
Hercule Poirot and Miss Marple introduced to the world of Mr. Men Little Miss
Two classic re-tellings are out now in the UK
The first two titles in this thrilling new partnership between Sanrio and Agatha Christie Limited were published in October 2025 in the UK.
Mr. Poirot: Mischief on the Nile and Little Miss Marple: Muddle at the Vicarage are available to purchase online, and from all good bookshops.
This is the first time that Agatha Christie's mysteries have been reimagined for pre-school and primary age children in an illustrated book format. Discover these titles below, and find out more about the coming together of two much-loved and best-selling literary brands.
About the Partnership
The first titles were published October 23rd 2025. US publication is expected in 2026. These are set to be a delightful celebration of two much-loved and best-selling literary brands, sure to delight readers of all ages.
My father, Roger Hargreaves, created the Mr. Men in 1971. His books met with near immediate success and since then the Mr. Men and Little Miss have entertained generations of children. I have had the privilege from 1988 to continue to draw and write for the series. It has been a real pleasure and an intriguing challenge to bring together the timeless mysteries of Agatha Christie with the playful world of the Mr. Men and Little Miss. Agatha Christie’s iconic stories now have a new twist that neither she nor my father might have imagined!
As a lifelong fan of the Mr. Men Little Miss books, it has always been a wish of mine to put our beloved detectives, Hercule Poirot and Miss Marple, into their universe. These clever and very funny re-imaginings of my great grandmother’s stories, which include some of my favourite characters (in rather suspicious circumstances!), are bound to delight fans of both authors. This is absolutely a dream collaboration.
For many of us, reading is a habit that begins in childhood, often nurtured by the books shared with us by parents and grandparents. That’s why it’s so rewarding to see our Mr. Men and Little Miss characters play a part in introducing Agatha Christie’s iconic mysteries to a new generation. This collaboration brings together two beloved storytelling worlds in a playful and engaging way, and we’re thrilled for fans to discover these fresh takes on her classic tales.
We are thrilled to be working with Agatha Christie Limited and Sanrio to bring a charming collaboration between two legendary literary estates – Mr. Men Little Miss and Agatha Christie - to life. Our heartwarming and funny takes on classic Christie stories will have huge appeal to new and established fans of Mr. Men Little Miss and Agatha Christie alike.
I’ve been working on Agatha Christie at HarperCollins for 30 years, always looking for ways to innovate and to expand the author’s already unrivalled popularity. In all that time, nothing has come close to the joy of seeing these cherished characters so painstakingly transformed by Adam Hargreaves into stories that will capture the hearts and minds of children everywhere. And Agatha Christie’s adult fans will adore them, too. He’s an absolute genius.
Copyright © 2025 THOIP (a SANRIO company) and Agatha Christie Limited. All rights reserved.
