Mousse's Treasure

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Co-Authors / Illustrators
  • Sophie Lewis
Publisher Name
Transit Children's Editions
Age Range
4+
Release Date
February 03, 2026
ISBN13
979-8893380293
ISBN10 or ASIN
   
In the third volume of this critically acclaimed series, Mousse learns during a visit from his niece that some treasures are truly priceless.
Mousse has meticulously prepared for his niece Pistachio’s arrival. He’s gone to the bakery to buy fresh bread and cheese. In her room, he’s set out a fresh notebook, with pens and colored pencils, and put together a small library with his favorite books. But Pistachio has plans of her own: she only wants to play in the waves.

When Mousse receives a letter from his friend Barnacle about a rummage sale, he and Pistachio rush to the attic to prepare, stumbling upon the treasures hidden in his old house. What memories do they hold? 

Editor review

1 review
Playful Beaches and Intergenerational Memories
(Updated: June 15, 2026)
Overall rating
 
4.5
Plot
 
4.0
Characters
 
5.0
Writing Style
 
4.0
Illustrations/Photos (if applicable)
 
5.0
Mousse, a stripey, long-nosed creature with a home by the beach, happily prepares for a visit from his little niece, Pistachio. He has lots of fun planned, but he can't help but feel curmudgeonly when Pistachio dismisses his ideas and spends all of her time playing in the waves. However, an upcoming rummage sale (which Mousse also grumps about) sends them to the attic, where old treasures and memories await, and maybe Pistachio will be convinced that there are more wonderful things than the beach afterall.

It's a charming, quirky, pastoral tale. Not having read the two previous Mousse books, I enjoyed this one as a standalone, and I left curious to know more about this little world. Mousse and Pistachio's interactions illustrate how sometimes people come across as grumpy and set in their ways, like Mousse, especially when faced with a child's carefree and perhaps selfish enthusiasm. Yet inside Mousse is a great big lovable heart that delights in sharing his world with friends and family, even if he grumbles a bit and claims not to see the point in rummage sales, and argues with potential buyers the entire time. I see people who I know in Mousse, as well as a little bit of myself.

This is a great summertime pick for readers who are looking for both words and pictures, and to chuckle at the love and patience shared among family.
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