A mysterious clock, once belonging to Napoleon, propels four young adventurers across Paris in a race against a shadowy adversary. When new information about the Star of Stone surfaces, Mistral, Elettra, Harvey, and Sheng reunite in the city of lights. An archaeologist friend of Harvey's father reveals the clock's secrets, setting the children on a quest for an artifact connected to the Egyptian goddess Isis. They must decipher the clock's mechanisms and navigate Paris's hidden corners, all while evading a dangerous woman with a penchant for venomous plants and a vast network of spies.

This installment in the Century series offers a Da Vinci Code-like adventure tailored for young readers, blending historical intrigue with a fast-paced mystery. The narrative propels the protagonists through iconic Parisian landmarks, utilizing a mysterious artifact to drive the plot forward. The introduction of a formidable antagonist with unique and dangerous characteristics raises the stakes for the young heroes. Readers familiar with authors like Blue Balliet and Trenton Lee Stewart are likely to find this book engaging due to its blend of puzzle-solving and suspenseful pursuit.