Fevre Dream
By George R. R. Martin
Book published in 1982 (released 2004-09-28)
Description
Currently out of print, but will be republished this year. From his web site:
"This one is a historical horror novel, a tale of vampires on the Mississippi in the antebellum period, during the heydey of the great steam packets. Bram Stoker meets Mark Twain."