'Clever, inventive and a cracking read' - Eoin Colfer, author of Artemis Fowl, on THE CLOCKWORK CONSPIRACY
Isaac Turner's scientific know-how has saved the day once, but he is now faced with a whole new mystery to investigate.
When a vanishing boy runs off with a stolen letter, Isaac and Hattie become locked in a race to uncover the lost vault of Louis XVI, an adventure that will take them on a wild chase across Paris, from the Louvre to the catacombs.
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