The Tomorrow Series: Tomorrow When the War Began - John Marsden

''Compulsively readable'' New York TimesSomewhere out there Ellie and her friends are hiding.Their country has been invaded. Everyone they know has been captured. Their world has changed overnight.They''ve got no weapons - except courage.They''ve got no help - except themselves.They''ve got nothing - except friendship.How strong could you be, if the world was full of people trying to kill you?Fans of Veronica Roth, Suzanne Collins and Michael Grant - prepare to be hooked by the Tomorrow series.