Le Club des Cinq et le trésor l'île (French) | Enid Blyton

For the first time, siblings Julian, Dick, and Anne spend their school holidays with their cousin George (short for Georgina) and her loyal dog Timmy at Kirrin Cottage. While exploring the nearby Kirrin Island, the children discover the ruins of an old castle and stumble upon an ancient map that hints at hidden treasure. Their curiosity quickly turns into a thrilling adventure as they race to uncover the island’s secrets—facing danger, uncovering clues, and strengthening their bond as the now-iconic Famous Five.