The Tomorrow series is a series of seven young adult invasion novels written by Australian writer John Marsden, detailing the invasion and occupation of Australia by a foreign power. The novels are related from the first-person perspective by Ellie Linton, a teenage girl, who is part of a small band of teenagers waging a guerrilla war on the enemy soldiers in the region around their fictional home town of Wirrawee. The name of the series is derived from the title of the first book, Tomorrow, When the War Began.