Croaky: Caverns of the Gemosaurus
Book 3 of 4 in CroakyView the full series
The Mossbridge Scouts follow a map into the caverns, which is where the Gemosaurus lives. The most visually spectacular Croaky adventure yet, with an underground world full of gems, danger, and exactly the kind of comic peril that keeps reluctant readers turning pages.
- Best for5–8
- FormatIllustrated
- Length96 pp
- Read aloud~1 hr20 min
The vibe
What it’s like.
Style
- Conversational
- Comedic
- Onomatopoeic
Tone
- Funny
- Silly
- Exciting
- Adventurous
- Suspenseful
- Absurdist
- Warm
Themes
Experience meters
What’s it about?
The story.
A map. A legend. A cavern full of gems, and, less ideally, a Gemosaurus. The third Croaky book goes underground, and Long takes full advantage: the cavern setting allows for a visual palette completely different from the wilderness adventures of books one and two, and the Gemosaurus is a wonderfully conceived antagonist, enormous, alarming, and handled with the same comic lightness that characterises all the danger in this series. The disaster-survival elements are more pronounced here than in previous entries; the sense of genuine (if always comedic) peril makes this the most suspenseful of the four books. Croaky's particular blend of determination and tactical improvisation is at its most satisfying, and the underground world rewards close inspection of every illustration.
Fit check
Right for your child?
Where it lands by age
- 1
- 3
- 5
- 7
- 9
- 11
- 13
- Best fit · 5–8
- Read aloud · 5–8
- Independent · 6–9
Prose load
Moderate
Visual support
High
Reluctant-reader friendly
Very
Read-aloud quality
Workable
Works well for
- Reading together
- Reluctant readers
Nothing in the book is likely to concern most parents. Safe to recommend without preview.
Bedtime suitability
3 / 5 · Workable
Sensitive-child
3 / 5 · Mostly fine
Graphic intensity
1 / 5 · None
Best for
- Reluctant readers
- Laugh out loud
- Strong characters
Avoid if
No common reasons to avoid this one — a rare clean sweep on the sensitivity flags.
Particularly good for children who are…
- Reluctant reader
- Struggling with reading
- Making friends
- Nightmares or fears
In the classroom
How it works in school.
A funny, action-packed early adventure series — a reluctant-reader pick 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 Gemosaurus — the Mossbridge Scouts following a map into the caverns, gems everywhere, an enormous alarming antagonist guarding them, the disaster-survival peril more pronounced than in the earlier Croakys. The most suspenseful Croaky and the most visually spectacular.
- Adventure and freedom
- Surviving danger
- Trickery and cleverness
- Animal companions
Why parents love it
The third Croaky — underground setting giving Matty Long a wholly new palette, the Gemosaurus a properly conceived antagonist handled with the series' comic lightness. Most plot-strong entry yet. Reliable reluctant-reader graphic comedy.
- Shared humour
- Quick to read
- Bedtime appropriate
In the series
Croaky.
4 books · open the series →
About the author & illustrator
Matty Long.
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.
Buy or borrow
Pick up a copy.
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- Waterstones ↗
- Amazon UK ↗
- Hive ↗
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