Durstan and Urtha Aldrich set out on a honeymoon pleasure cruise and are soon beleaguered by pursuers bent on destruction, as they try to escape the sea by land, they are set upon by paid assassins and barely escape with their lives, it is only when they reach the southern limit of the Jada sea and obtain permission to enter the mysterious Thantra subcontinent that they find a respite from danger. They find clues to the location of the legendary Book of Summoning: The Necronomicon.