Atlantis has defined Nina Wilde's life. Her parents' obsession with the lost city cost them their lives, but finding it brought Nina to her husband Eddie Chase and a series of archaeological treasures. A decade later, the duo join a mission to locate the Secret Codex, an account of ancient Atlantean explorer Talonor's journeys, thought to be located in the ruins of Atlantis. But when a long-lost relative reappears in Nina's life, asking her to use the Codex to find the secret of King Midas, she is unprepared for the devastation that follows. The promise of unlimited gold has aroused the greed of powerful and ruthless forces... and only Nina and Eddie stand in their way.