The year is 1635. Iceland is a world darkened by superstition, poverty and cruelty. Men of science marvel over a unicorn's horn, poor folk worship the Virgin in secret and both books and men are burnt. Jona Palmason, a poet and self-taught healer, has been condemned to exile for heretical conduct, having fallen foul of the local magistrate. Banished to a barren island, Jonas recalls his exorcism of a walking corpse on the remote Snjafjoll coast, the frenzied massacre of innocent Basque whalers at the hands of local villagers and the deaths of his three children.