In 1825, Five young people are recruited by the Alcibiades organization, a secret society working for the British Crown. They are tasked with finding and recovering lost treasures around the world in order to fund the organization. Their first mission will also be their final exam: they are to embark on the high seas in search of a fabulous, sunken treasure. However, barely out of port, they find their quest threatened by a mysterious and powerful rival of the organization. The two crews thus begin a no-holds-barred, high-speed chase across the water.