The Third Day, the Frost (also published as A Killing Frost in the U.S. and Canada) is the third book in the Tomorrow series by John Marsden. It is a young adult invasion literature novel, detailing the occupation of Australia by an unnamed foreign power. It continues the story started in Tomorrow, When the War Began and The Dead of the Night. Its title derives from a line in William Shakespeare’s play, King Henry VIII "The third day comes a frost, a killing frost..." which also serves as the book's epigraph. Source: Wikipedia (en)