Two siblings. One prophecy. A storm that will shake Olympus. When Percy and (Y/N) Jackson discover they are the twin children of Poseidon, their world fractures into a reality of monsters and ancient grudges. With a stolen Master Bolt threatening a war between gods, the twins must team up with Annabeth and Grover to navigate a landscape of myth. But as the "Twinned Souls" of the sea, their bond is the only thing standing between the world's salvation and its total destruction.