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The Clockwork Conspiracy: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

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Isaac Turner Investigates Series

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(16 reviews)

Sam Sedgman is the brilliant author behind one of our favourite middle-grade series: Adventures on Trains. But that's not his only series! Isaac Turner Investigates is another fantastic mystery middle-grade series packed full of adventure, friendship and, of course, secrets. 

The books follow a young twelve-year-old boy called Isaac Turner, who loves science and engineering, taking things apart and seeing how they work. His father is a horologist (the keeper of the Big Ben clock), and he suddenly goes missing the very night the clocks go back. And so his mystery-solving skills are set to good use. In each book, together with his friend Hattie, the rebellious daughter of the speaker of the House of Commons, Isaac has a new mystery to solve and a new city to explore, as well as a new area of scientific discovery to unravel, from clockwork to mapmaking. 

The books approach themes of bravery, politics, family, friendship and science.

If you read this series and would like to read more, do take a look at our blog post about the Best Crime and Mystery Series for ages 9 and 10.

All the Isaac Turner Investigates books in order:

Book 1: The Clockwork Conspiracy (2024)
Book 2: The Forbidden Atlas (2025)

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Book 1
The Clockwork Conspiracy: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman
Book 1

The Clockwork Conspiracy: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

** Shortlisted for the BOOKS ARE MY BAG Readers Award for Children's Fiction **‘Clever, inventive and a cracking read’ –... MoreThe Clockwork Conspiracy: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

(11 reviews) 5 11
Review
Book 2
The Forbidden Atlas: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman
Book 2

The Forbidden Atlas: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

The exhilarating sequel to The Clockwork Conspiracy, Isaac Turner is back for another action-packed mystery adventure.'A... MoreThe Forbidden Atlas: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

(2 reviews) 5 2
Review
Book 3
The Galileo Heist: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman
Book 3

The Galileo Heist: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

The third adventure in the Isaac Turner Investigates series sees Isaac’s summer in Italy go horribly wrong when he becom... MoreThe Galileo Heist: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

(3 reviews) 5 3
Review
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The Galileo Heist: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

The Galileo Heist: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

12th February 2026
(3 reviews) 5 3

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The Clockwork Conspiracy: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

The Clockwork Conspiracy: The exhilarating action-packed mystery series where science meets adventure from Sam Sedgman

1st February 2024
(11 reviews) 5 11

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