- Illustrated Chapter Books
- Ages 7–10
- Comedy
The 117-Storey Treehouse
Book 9 of 13 in The Treehouse SeriesView the full series
A ninth Treehouse adventure with a tiny-horse level, pyjama-party room and Underpants Museum, keeping the series' ridiculous architecture fresh. It remains one of the most reliable funny-visual reads for reluctant readers.
- Best for7–10
- FormatIllustrated
- Length288 pp
- Read aloud~4 hr5 min
The vibe
What it’s like.
Style
- Conversational
- Comedic
- Onomatopoeic
Tone
- Funny
- Silly
- Absurdist
- Irreverent
- Exciting
Themes
Experience meters
What’s it about?
The story.
Andy and Terry's treehouse has now grown to 117 storeys, adding a tiny-horse level, a pyjama-party room, an Underpants Museum and Treehouse Information Centre, and many other features that seem designed to prevent the boys from getting any actual work done. The ninth book continues the series' cheerful contract with the reader: every new set of thirteen floors brings new jokes, new disasters, new cartoons and new reasons for the story to veer away from the supposedly sensible task of writing a book. Terry Denton's illustrations keep the pages energetic and approachable, while Andy Griffiths' narrator voice makes the prose feel conversational rather than demanding. This is a strong confidence-building read for children who want the satisfaction of finishing a chunky book but prefer constant pictures, jokes, signs, lists, diagrams and silly interruptions to long blocks of text.
Fit check
Right for your child?
Where it lands by age
- 1
- 3
- 5
- 7
- 9
- 11
- 13
- Best fit · 7–10
- Read aloud · 6–10
- Independent · 7–11
Prose load
Moderate
Visual support
Very high
Reluctant-reader friendly
Very
Read-aloud quality
Strong
Works well for
- Reading aloud
- Reading together
- Reluctant readers
Nothing in the book is likely to concern most parents. Safe to recommend without preview.
Bedtime suitability
2 / 5 · Better outside bedtime
Sensitive-child
4 / 5 · Good fit
Graphic intensity
1 / 5 · None
Best for
- Diary of a wimpy kid fans
- Captain underpants fans
- Silly humour
- Visual readers
- Reluctant readers
Avoid if
- Prefers realistic stories
- Prefers calm books
- Needs tight plot
- Dislikes shouting
Particularly good for children who are…
- Reluctant reader
- Struggling with reading
- Neurodiversity or learning differences
In the classroom
How it works in school.
The anarchic, hugely funny Treehouse series — a legendary reluctant-reader hook and classroom-library staple.
A book children love that happens to support school — never a stand-in for the texts a class is taught with. Reviewed for the classroom · June 2026.
Why it lands
Why they love it.
Why kids love it
The specific kick is the Tangler — a new villain whose entire job is making everything literally tangled, including the boys, the treehouse and the plot. Tiny-horse level, pyjama-party room, Underpants Museum: every page is a fresh ridiculous thing.
- Adventure and freedom
- Having a secret base
- Secret world
- Trickery and cleverness
Why parents love it
The ninth Treehouse — the Tangler causes proper villainous chaos, more rooms than ever, the formula still working. The book a seven-year-old who's loved the previous eight will read in an afternoon. Cleanly engineered late-series volume.
- Shared humour
- Quick to read
- Conversation starter
In the series
The Treehouse Series.
13 books · open the series →
About the creators
About the creators.
If you liked this
Three ways out of this book.
If you liked this, try…
Lateral matches. Same shelf, different texture.
Come into this from…
Easier or preparing reads — perfect lead-ins.
Where to go next…
Escalation reads — a step up in scale, silliness, or stakes.
More like this…
Books that share themes and topics with this one.
Buy or borrow
Pick up a copy.
- Bookshop.org ↗
- Waterstones ↗
- Amazon UK ↗
- Hive ↗
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