"The Terror" by Dan Simmons. A fictional recount of the Franklin Expedition, which was sent out by the Royal Navy in the late 1840s to find an open water passage from Europe to Asia, through the Arctic Ocean.
960 pages of cannibalism, madness, murder, suicide, and a monster, which is not human, but craves human flesh. Also a surprising amount of dark humor.
This is the first time I've read one of his books, but I highly recommend it to all readers.
His next book is "Drood," which features Wilkie Collins, Charles Dickens, and Charles Dickens' final and unfinished novel "The Mystery of Edwin Drood."
I am also looking forward to reading this one, when it comes out in paperback.