"La fée des grèves" by Paul Féval is a historical adventure novel published in 1850. Set in 1450 during the final months of the Hundred Years' War, the story unfolds in the bay of Mont Saint-Michel, on the border between Brittany and Normandy. When a knight denounces the Duke of Brittany for fratricide, he becomes a hunted fugitive. His daughter, mistaken for the legendary fairy of the shores, tries to protect him while villagers and lovers become entangled in a dangerous conflict involving sieges, betrayals, and revenge.