Cogheart Series by Peter Bunzl 4 Books Collection Set - Ages 9–12 - Paperback

Titles in This Set:
Cogheart
Moonlocket
Skycircus
Shadowsea

Format: Paperback

Overview:
Four-book paperback collection The Cogheart Adventures by Peter Bunzl gathers Lily, Robert, and Malkin, the mechanical fox, for a thrilling journey through a steam-powered Victorian world. From the peril of Cogheart to the deep-sea intrigue of Shadowsea, the quartet combines mystery, science, and heart-stopping action for middle-grade readers aged 9–12. The set appeals to fans of adventure, friendship and clever gadgets, delivering sustained suspense with character-driven moments that encourage resilience and curiosity. This complete collection is a perfect gift for readers who crave intricate world-building and a roller-coaster plot.

What This Collection Covers:
Across the four titles, The Cogheart Adventures invites readers into a richly imagined era where steam-powered invention and human courage intersect. The books follow Lily’s determination as she navigates dangers with Robert, the clockmaker’s son, and Malkin, a loyal mechanical fox. Moonlocket introduces a dangerous quest around a legendary artefact; Skycircus tests trust amid showmanship and deception; Shadowsea plunges the trio into deep-water mysteries beneath New York’s glitter. The tone balances brisk suspense with warmth and humor, while the world-building—airships, submarines, and clockwork creatures—invites readers to imagine, solve puzzles, and cheer for brave choices. The collection works well for confident readers transitioning from standalone novels to a longer series and serves as a memorable gateway into Victorian-inspired adventures.

Book-by-Book Guide:
Cogheart
In Cogheart, Lily’s life is turned upside down when her father disappears and silver-eyed men stalk the shadows. Joined by Robert, the clockmaker’s son, and Malkin, her mechanical fox, she steps into a murky world where trust is scarce and danger lurks around every corner. Peter Bunzl crafts a vivid Victorian landscape of gears, airships, and hidden machines, grounding wild invention in human emotion. The plot pulses with danger and discovery, while Lily’s courage anchors the story and invites readers to root for her as she learns who she can rely on—and what she’s willing to fight for.

Moonlocket
Moonlocket widens the stakes as the Jack of Diamonds pursues a mysterious Moonlocket and drags Lily and Robert into a web of past secrets. The duo must decipher loyalties, outwit a formidable foe, and keep their friends safe as danger tightens its grip. The book explores trust, resilience, and the costs of curiosity, all wrapped in Bunzl’s signature blend of whimsy and peril. Malkin remains a steadfast ally, guiding readers through a labyrinth of clues toward a reveal that reshapes the series’ moral map.

Skycircus
A travelling skycircus lands in Brackenbridge, and Lily and Robert can’t resist stepping aboard. But beneath the glittering tents lie hybrid children with hidden agendas and a plot that could tear their friendship apart. Treachery, daring rescues, and breathtaking aerial sequences propel this installment, as Lily and Robert confront manipulation and danger with growing wits and courage. Skycircus broadens the Cogheart universe with spectacle and heart, making it a satisfying bridge between mystery and wonder for younger readers hungry for more.

Shadowsea
Shadowsea hurls Lily, Robert and Malkin into the bright bustle of New York, only to reveal shadows beneath the surface. A captive boy, an enigmatic underwater mystery, and a vengeful villain escalate the stakes as clues collide with danger. The trio’s bond is tested as they race to expose a deadly truth before it sinks them. This final adventure blends fast-paced action with emotional depth, delivering a memorable, triumphant note about friendship, loyalty, and facing fears together.

Who This Set Is Perfect For:
Young readers aged 9–12 who crave immersive world-building, clever gadgets and cliffhanger chapters will love this four-book collection. It’s ideal for fans of mystery, steampunk aesthetics and heroine-led quests, whether read aloud at home or enjoyed as independent reading. The set also suits school and library collections, reading groups, and gift-giving occasions, offering a complete, self-contained arc that can be explored over weeks or months. If your child enjoys brave heroines, loyal animal companions, and fast-paced adventures with heart, this collection is a durable, inspiring addition to their bookshelf.

Key Benefits:

• Complete four-book paperback collection for steady, connected reading
• Rich steampunk world-building that sparks the imagination
• Strong, resourceful heroine alongside a memorable mechanical companion
• Great gift set for birthdays, holidays or classroom libraries
• Encourages reading stamina and series curiosity
• Supports discussion of teamwork, courage and ethical choices

About the Author:
Peter Bunzl is the author of The Cogheart Adventures, a beloved middle-grade series that blends Victorian atmosphere with clockwork invention and suspense. Bunzl is a talented writer and BAFTA-winning animator, bringing a cinematic feel to Lily, Robert and Malkin’s journey. His books are celebrated for their imaginative world-building, strong character dynamics and accessible storytelling that appeals to reluctant and confident readers alike. This quartet showcases his knack for weaving danger and warmth into a seamless, memorable reading experience that invites ongoing curiosity and engagement with the world he created.

Why You’ll Love This Set:
This four-book collection makes a lasting, immersive reading experience easy to own and share. With a complete arc across Cogheart, Moonlocket, Skycircus and Shadowsea, readers enjoy a coherent, escalating journey that builds confidence and fosters a love of discovery. The paperback format keeps pages comfortable to handle, and the cohesive set is perfect for gifting, school libraries, or family reading rituals. If you’re looking for a high-impact, story-driven set that rewards commitment and curiosity, this Cogheart collection is a confident choice.

Please Note: The individual books included in this listing will be dispatched as per the original UK ISBN and UK edition cover image shown in the image.