For fans of 'Hunger Games' (Suzanne Collins):

Tomorrow, When the War Began

Common themes: war, dystopia

Author: John Marsden
Series: Tomorrow series
Publisher: Boston, Mass.: Houghton Mifflin, 1995

This book tells the story, of first-person narration, of a group of teenagers who find their country has been invaded by unknown foreign forces while there were away camping.

Ellie is the protagonist, tasked by her group to write down their story and the outside events that contributed to their situation. Seeing their town empty and livestock dying, the local citizens held hostage by these foreign military invaders, and forced to go into hiding; the group use their strength and wits to concoct brazen plans that foil the actions of the invaders and also ensure the group’s survival.

The book has many similarities to ‘The Hunger Games.’ In terms of plot, the setting is a dystopian one with the protagonists in a desperate situation where they must survive against all the odds. War is also a prevalent theme. Both series’ are packed with action and exciting tension whilst also providing a few slower, and sometimes comic, moments to allow for deeper character interaction and development. 

For more information: 
Goodreads
Author website