In 1845 an expedition under the commandment of experienced polar explorer sir John Franklin goes on the ships Terror and Erebus to the North coast of Canada in searching of North West passage from the Atlantic ocean to the Pacific ocean and disappears without a trace. The searching s of the expedition have been carried out in several decades. The information about it was gathering bit by bit. Dan Simmons offers his own version of the events. The main threat to the expedition was not icebergs, the dead of winter and spoiled canned food. It was a stranger gigantic monster of snow and polar dark.