Death Masks is the story of Harry Dresden, a wizard detective living in Chicago, who is drawn into a case when a powerful demon, Nicodemus, steals the Shroud of Turin and uses it to cause a terrible plague. Harry, aided by three holy knights, races to stop Nicodemus and prevent the plague from touching off a Biblical apocalypse. Harry's journey is marred by loss and injury, but in the end he is able to thwart Nicodemus's designs.