Owen Godfrey is spending his summer in Paris studying science fiction writer Jules Verne, the brilliant mind behind Twenty Thousand Leagues Under the Sea and Around the World in Eighty Days. When Owen and his new friends find what appears to be a dusty copy of Verne's collected works in an old bookshop, they're intrigued by the hidden codes written inside. As one clue leads to another, the trio gets swept up in an epic treasure hunt spanning the city--from the depths of the catacombs to the top of the Eiffel Tower, and by way of skateboard, boat, car, and even a hot air balloon! But they quickly realize they're not the only ones searching for the hidden riches, and that there are others who will stop at nothing to get to them first. This fast-paced larger-than-life adventure is filled with action, high stakes, and three friends who are dead set on cracking the Jules Verne mystery.