Skycircus
by Peter Bunzl · The Cogheart Adventures #3
A steampunk adventure about a girl with a mechanical heart who discovers the courage to fight for others' freedom
The story
When fourteen-year-old Lily Hartman receives mysterious invitations to a traveling skycircus, she expects wonder and spectacle. Instead, she finds herself trapped aboard an airship with a vengeful enemy and a group of children who have been forcibly augmented with mechanical parts. To escape, Lily must rally an unlikely rebellion — but first she must answer the question that has haunted her since childhood: what makes her tick?
Age verdict
Best for ages 10-12. Advanced 9-year-olds can handle the content with adult support. The themes of exploitation and forced confinement are handled with restraint and hope, but are more intense than typical middle-grade fare.
Our take
Adventure-driven book with strong emotional payoff and thematic depth that entertains kids powerfully while offering genuine growth value and classroom utility; parent scores are held back by fantasy genre's limited real-world window.
What stands out
Each audience's top 3 dimensions. Out of 30 scored per book.
Kids love
- Heart-punch Strong
Multiple genuine emotional peaks earned through careful accumulation: the notebook destruction where Lily sinks to the floor smoothing torn pages, the hybrid children's individual backstories of forced augmentation, and the climactic flight above the Eiffel Tower delivering transcendent joy after sustained struggle. Comparable to Earthquake in the Early Morning (8, three emotional paydays at different scales), with the Angela-to-Angelique transformation arc adding an additional dimension of earned triumph.
- Ending satisfaction Strong
The rebellion delivers cathartic group empowerment, Angelique's flight fulfills the prologue's literal and metaphorical promise, and the epilogue provides reflective closure without over-tying threads — the hybrid children choose community, Robert recovers his father's coat, Lily begins writing her own story. Comparable to Mercy Watson: Something Wonky This Way Comes (8, every thread resolves completely) with the added emotional depth of thematic fulfillment across the entire book arc.
Parents love
- Moral reasoning Strong
The rebellion sequence poses genuinely difficult questions about complicity, collective action, and individual power within oppressive systems — 'Are you really outside the cage? Or are you trapped too?' Performers face real ethical choices with consequences. Lily must decide between self-preservation and fighting for others' freedom. Comparable to The Maze Runner (8, internal conflict about questioning leadership) with the added sophistication of systemic rather than personal moral dilemmas.
- Emotional sophistication Strong
The resolution acknowledges that trauma doesn't disappear — 'the wounds never fully disappear; the evidence of them is still there, like old scars' — while offering hope through integration rather than cure. The hybrid children are simultaneously victims and survivors, neither helpless nor superhuman. Comparable to Hollow City (7, trusted character breakdown revealing guilt layered with self-awareness) in modeling complex emotional states without simplifying them.
Teachers love
- Discussion fuel Strong
Nearly every major theme generates genuine student disagreement: Is silence complicity? When is rebellion justified? Are the circus performers responsible for the children's exploitation? What makes someone 'different' versus 'disabled'? The parallel stories of Angela and Angelique invite discussion about how transformation happens and what freedom means. Comparable to Earthquake in the Early Morning (8, four strong discussion prompts) with more complex ethical territory for older students.
- Read-aloud power Strong
The prose has natural rhythm and musicality — the repetitive opening ('Drink the air. Kiss the clouds. Swallow the sky'), varied sentence lengths during tense scenes, and distinctly voiceable characters (Malkin's sardonic tone, Madame's imperious speech) make this performable. Comparable to The Golem's Eye (7, Bartimaeus's sarcastic asides and dramatic timing) with similarly performable character voices.
✓ Perfect for
- • Readers who loved the inventive worlds of Nevermoor or The Invention of Hugo Cabret
- • Kids fascinated by steampunk, circus settings, and mechanical inventions
- • Children ready for adventure stories with genuine emotional depth and moral complexity
Not ideal for
Readers who prefer humor-driven or contemporary realistic stories, or those who need a standalone entry point — this is book three in a series with important prior events.
⚠ Heads up
At a glance
- Pages
- 432
- Chapters
- 30
- Words
- 65k
- Difficulty
- Moderate
- POV
- Third Person Limited
- Illustration
- Sparse
- Published
- 2018
- Illustrator
- Becca Stadtlander
Mood & style
You'll know it worked when…
A reader who enjoys the first few chapters will likely finish — the pacing accelerates as the story progresses, and the emotional investment deepens. If a child finds the opening too slow, suggest pushing through to the circus scenes.
More like this
Same genre, similar age range. Ranked by kid score.
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by J.K. Rowling
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The Neverending Story
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