Josephine Routledge is the twin sister to John B Routledge. Their dad goes missing during the search for the famous shipwreck, the Royal Merchant. The twins and their friends, JJ, Pope, and Kiara, come across the sunken boat that holds a clue to the missing Routledge, setting them on the track to finding the four-hundred million dollars that sunk in the ocean. Will the treasure hunt bring them all closer together, some more than others, or will it tear them all part?