A tremendous wave is approaching the ship.""...the last message and only clue to a series of disasters which mysteriously destroyed three immense ocean liners. The international operatives of the secret organization 25 are all at sea in this one what with a mad Hindu, an underwater world, a new flawless race and the secret of life all down in the depths. Can agent Sap Palfrey offset the impending world crisis? Splash, dash and flash entertainment.