Monsieur Mustard: The Disappearance of Fabio Fangtooth

by Charley Rabbit

Monsieur Mustard curls his whiskers just so, slips on his fancy suit, looks at the handsome front-page picture on the newspaper announcing his arrival in the city of Bath, and chuckles happily to himself. As soon as he leaves the house, he is mobbed by admirers, as usual. But just as he starts to sniff out his first mystery, everything seems to go his detective bag is stolen, he is knocked off his feet and his monocle shatters. It appears that not everyone is happy to have the world-famous detective in their city . . . With the help of new friends, can Monsieur Mustard crack the case before the villain catches him?

'Quirky and fresh! J'adore Monsieur Mustard' Sheena Dempsey

Genres: Childrens, Animals

236 pages, Kindle Edition

Published November 6, 2025

Reviews

[Grace Moovans]

Read with OM.

I love Poirot, so why wouldn't I love a mouse version of him, with comic strip action scenes, and a dastardly villain! C'est tres bien!

7 year old also loved it.

[Tracy Hager]

One of my library families returned this book and made a point of stopping at the desk to tell staff that it was an absolute hilarious gem. Brilliant for adults who love putting on accents, and very funny for children. They will learn some new French exclamations - et Voila!

[Bookread2day]

This book is very smart and very funny.

I loved how some of this story has been written, part in chapter of writing and part in comic form, which I know that children will love this book layout and story too!

Monsieur Mustard is nearly the smallest mouse detective, has moved to the city Bath, on the lookout for his new mystery to solve.

When a restaurant owner a reptile, snake, named Fabio Fangtooth, closes his restaurant, he goes missing.

Has any creature got information on Fabio’s whereabouts?

Monsieur Mustard The Disappearance of Fabio Fangtooth is so highly hilarious, I hear children roaring with laughter!

[Nena]

Superwitzig, spannend, herrlich gezeichnet und großartig zum Vorlesen. Die deutsche Ausgabe hat eine Stanzung im Deckel und ist wirklich liebevoll und aufwendig gestaltet. Superbuch!

[whatbooknext]

Monsieur Mustard has moved from Paris to live in the buttery coloured city of Bath in England. He is not quite the smallest detective alive, but he is definitely the most famous, dapper and clever detective. Bath is very lucky to have him on hand to call when a resident goes missing!

A renowned restaurant owner named Fabio Fangtooth has vanished from his restaurant. The police are soon on hand, but they don’t know where to start. Never fear, Monsieur Mustard is here!

He soon gets to work, following the clues, with the help of a creature who is not quite sure what kind of rodent he is, but knows he wants to be Monsieur Mustard’s assistant. Monsieur puts up with him, even though he always works alone. It’s not long before the famous detective is flying across Bath with the police, only to discover another Bath resident missing! What is going on in his new city?

Alas, the dastardly deeds aren’t over, when yet another goes missing. Can Monsieur Mustard crack he case, or are his detective days done?


This mouse mystery is funny, clever and richly illustrated throughout this junior chapter novel. There are illustrations on every page and sections of graphic novel which move the story on quickly.

The story is hilarious, with pigeon police, plenty of mishaps, and villains to track down. Toilet humour is rife with a detective’s assistant with a nervous disposition and a resulting bottom burp problem. It is both terrible and helpful in equal measure as a tiny fabulously dressed mouse works on a mystery.

This is a new series for emerging readers, and is sure to become a firm funny favourite.

Age – 7+

[Claire Smith-Simmons]

Oh how much fun we had with this book, with a wonderful array of characters that we could give funny voices and accents to, we raced through the story and didn't want it to end. It had mystery, comedy and suspense as well as action, so it was perfect for my 7 year old and his active imagination. The change in styles between chapter to graphic novel and then to illustrations really captured his attention throughout the read. The characters were varied and the relationship between Monsieur Mustard and Mobbsy was lovely, seeing Monsieur Mustard come to slowly rely on him was a great touch.

A great book to cover friendship, perseverance, failure and determination, different personalities. Recommended by both Claire and Henry for this one! Looking forward to more adventures from this new detective duo.

Thank you to the author, publisher and Netgalley for our copy.

[Laura Moon]

🐭🕵️‍♂️Monsieur Mustard: The Disappearance of Fabio Fangtooth🕵️‍♂️🐭

Written and illustrated by Charley Rabbit

'Grandes saucisses de Paris' Monsieur Mustard is fab.

Monsieur Mustard is a small, dapper dressed, famous, crime solving mouse. He arrives in the city of Bath to swarms of admirers. His bag is stolen and it makes it very difficult for him to solve his big crimes!

My boys loved looking through the illustrations trying to work out what happened to Fabio, Mr B and co! We loved Mobbsy. He is the ultimate Monsieur Mustard fan. We belly laughed at Mobbsy's pronunciation of Monsieur and we had a good chuckle at the Beantinley! Another of our favourite moments was Monsieur Mustard falling in the soup. We thought his reasons for the culprit were very clever.

[Rebekah]

A good little mystery with gorgeous illustrations and likeable characters, but overreliant on farting jokes to bring humour (and they don't).
This could have been great without the toilet humour and with a bit more pace and tension, because it did start to drag. But the illustration work is perfection.


CW:
- Lang - chuffing, oh my gosh (the book says that's also what 'Oh là là' means in French, which isn't quite right), fart
- police officer slaps someone on the bottom
- incessant farting jokes
- villain wants to turn animals into hats
- character gets eaten and then regurgitated
- mustard coloured farts illustrating a double-spread and more
- baboon bottoms illustrated

[Leona]

Monsieur Mustard is about to bring a much needed dollop of bliss in the world. This story is so satisfying and the quirky characters are a huge bundle of fun. The goodies and the baddies alike, will light up the eyes of every reader. I found the style of the book inviting with the colour palette and the lovable illustrations add to the wonderful reading experience.

C'est magnifique!

I received an early copy from the publishers via NetGalley in exchange for a review.

[Sam Seaton]

This is a wonderfully fun and charming children’s book with a unique main character. Monsieur Mustard, the tiny but very confident detective mouse, is full of personality, and his dramatic arrival and unexpected mishaps make the story really entertaining from the start. My daughter and I found it absolutely hilarious and loved the unique style of illustration.

[Lizzy]

My seven year old loves this book so much. It’s really made him laugh. It’s his new favourite book. I enjoyed reading it to him too. Nice mix of graphic novel and illustrated character book. I’m a big Poirot fan too so enjoy the nod to the classic detective. It’s hard to find children’s book we both enjoy as much. More please!

[Hannah Rials Jensen]

Such a fun mystery for confident young readers! Helps that the shop where I work is featured and so fun to have another book set in Bath!

[YN]

3.5 Geronimo Stilton meets Hercule Poirot.
The onomatopoeia and comic strips were engaging and I enjoyed the sleuth but found the motive relatively weak.

#ARC review