The crew of the Grinning Manta make their living by seeking out lost treasures at the bottom of the ocean. They take risks that more sensible and better-funded treasure hunters would never consider. Recently, Miles Jefferson, the ship’s first mate and research archivist, has stumbled on what might be the score of the century – the ruins of a lost Greek Island civilization, buried in the deeps southeast of Sicily. If all goes well, the Manta and its crew will be rich beyond the dreams of avarice.