Titles in This Set. Cogheart (The Cogheart Adventures #1). Moonlocket (The Cogheart Adventures #2). Skycircus (The Cogheart Adventures #3). Shadowsea (The Cogheart Adventures #4). Details. Condition: New. Format: Paperback. ISBN: 9781801311618. Publisher: Usborne. Age Range: 9-12 years. Overview. Step into a world of clockwork invention, hidden dangers and unbreakable friendship with The Cogheart Adventures 4 Books Collection Set by Peter Bunzl. This paperback bundle gathers all four Victorian steampunk mysteries following Lily, Robert and the sharp-tongued mechanical fox Malkin. Packed with airships, automatons and daring escapes, it's an ideal shelf-ready set for confident and reluctant middle-grade readers, classroom libraries, or a gift enjoyed again and again on rainy afternoons.. About the Books. The series opens with Cogheart, in which Lily's inventor father vanishes and silver-eyed men begin stalking the shadows; teaming up with Robert, the clockmaker's son, and Malkin, the mechanical fox, she is drawn into a murky, menacing world where trust is tested at every turn. In Moonlocket, the criminal mastermind known as the Jack of Diamonds arrives seeking a mysterious locket, dragging Robert into peril as Lily and Malkin race to outwit him before he plays his final, deadly card. Skycircus whisks the trio away aboard a travelling flying circus after they uncover the sinister secrets of its hybrid performers, leading to treachery, tightropes and daring escapes high above the clouds. Finally, Shadowsea takes the adventure to a fog-wrapped New York, where haunted captives and undersea mysteries pull the trio into deep and dangerous waters as a vengeful villain closes in. Across all four books, Bunzl's inventive steampunk world-building sits alongside real emotional stakes — loyalty, loss and courage — giving young readers thrilling plots and characters worth caring about. Each book can be read as a standalone mystery, but together they form a satisfying, complete arc.. Complete 4-book paperback collection offering excellent value for fans of the series. Imaginative steampunk world-building combined with genuine emotional depth. Fast-paced mysteries ideal for reluctant and confident readers aged 9-12. Perfect for bedtime reading, classroom reading corners or library shelves. A memorable birthday or Christmas gift for young adventure and mystery fans. From a BAFTA-winning creative talent with a cinematic eye for storytelling. About the Author. Peter Bunzl grew up in South London surrounded by pets, an antique-dealer father and an artist mother, and spent childhood weekends visiting film and TV sets. That love of storytelling led him into a career as an award-winning animator and filmmaker before turning to writing fiction. His debut novel, Cogheart, launched The Cogheart Adventures to wide acclaim, praised for its atmospheric steampunk setting and gripping plotting.. Why You'll Love This Collection. Four thrilling, self-contained mysteries in one paperback set mean hours of steampunk adventure without hunting down titles — great value for fans and newcomers alike, and a brilliant gift for young readers who love clockwork, courage and a great escape.. Please Note: Cover design may vary slightly from the image shown; ISBN and edition are for the UK paperback set as listed.