Abner Marsh, a struggling riverboat captain, suspects that something’s amiss when he is approached by a wealthy aristocrat with a lucrative offer. The hauntingly pale, steely-eyed Joshua York doesn’t care that the icy winter of 1857 has wiped out all but one of Marsh’s dilapidated fleet; nor does he care that he won’t earn back his investment in a decade. York’s reasons for traversing the powerful Mississippi are to be none of Marsh’s concern—no matter how bizarre, arbitrary, or capricious York’s actions may prove. Not until the maiden voyage ofFevre Dreamdoes Marsh realize that he has joined a mission both more sinister, and perhaps more noble, than his most fantastic nightmare—and humankind’s most impossible dream.