- Graphic Novels
- Ages 7–10
- Comedy

InvestiGators: Take the Plunge
Book 2 of 9 in InvestiGatorsView the full series
Mango and Brash are back, this time navigating a water-based mission that takes the series' disaster_survival energy to new depths, literally. Green escalates the peril without losing the puns, and the scariness_level ticks up just enough to feel genuinely tense.
- Best for7–10
- FormatGraphic
- Length224 pp
- Read aloud~1 hr45 min
The vibe
What it’s like.
Style
- Comedic
- Conversational
- Onomatopoeic
Tone
- Funny
- Silly
- Exciting
- Adventurous
- Absurdist
- Irreverent
- Suspenseful
Themes
Experience meters
What’s it about?
The story.
Take the Plunge sends Mango and Brash into their second case with both the formula confirmed and the stakes raised. The disaster_survival engine replaces the first book's pure mystery structure: the agents find themselves in genuine physical jeopardy, water-based and escalating, which gives the comedy somewhere new to live. Green uses the water setting to expand the visual vocabulary of the series, sewers gave the first book its distinctive look, and the new aquatic terrain gives this one different spatial possibilities. A new villain or threat enters the picture, deepening the FISH (the antagonist organisation whose acronym puns are as elaborate as SUIT's) mythology that will run through the full series. The resilience deep theme (0.55) is new to this book, Mango and Brash have to persist through something that goes more wrong, for longer, than in the origin story. The scariness_level of 2 reflects that the peril feels slightly more consequential without becoming genuinely frightening. Readers who finished the first book and want the series to develop will find it does exactly that; new readers can start here with slightly less context on the duo's dynamic.
Fit check
Right for your child?
Where it lands by age
- 1
- 3
- 5
- 7
- 9
- 11
- 13
- Best fit · 7–10
- Read aloud · 6–9
- Independent · 7–11
Prose load
Light
Visual support
Very high
Reluctant-reader friendly
Very
Read-aloud quality
Strong
Works well for
- Reading aloud
- Reluctant readers
Nothing in the book is likely to concern most parents. Safe to recommend without preview.
Bedtime suitability
3 / 5 · Workable
Sensitive-child
4 / 5 · Good fit
Graphic intensity
1 / 5 · None
Best for
- Reluctant readers
- Mystery fans
- Series readers
- Dog man fans
- Adventure seekers
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
- Neurodiversity or learning differences
- Nightmares or fears
In the classroom
How it works in school.
A pun-filled spy-comic series — a reluctant-reader magnet 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 water — Mango and Brash's second case takes them out of their sewer-comfort zone and into proper aquatic peril, with the agents genuinely in trouble for the first time. A seven-year-old who liked book one gets the series escalating exactly as they hoped.
- Becoming invisible
- Being a detective
- Having a nemesis
- Having a secret base
- Secret world
Why parents love it
The InvestiGators where the series settles into its proper groove — second case, second villain, the pun-and-plot format clicking together. Best read right after book one to lock the cast in. Slightly higher stakes than the opener, still firmly safe.
- Shared humour
- Quick to read
- Conversation starter
In the series
InvestiGators.
9 books · open the series →
About the author & illustrator
John Patrick Green.
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.
- Bookshop.org ↗
- Waterstones ↗
- Amazon UK ↗
- Hive ↗
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