Sam’s world is on the brink of war. Helicopters are in the sky and there are riots in the streets. This may be his final chance to tell Cait how he feels, before everything ends. But then his invitation to the Last Party changes everything.

Years later, Hope lives in a closed world under the ground. Fourteen years ago, a war destroyed everything. But Hope makes a discovery — one which will link her story to Sam’s, and will reveal the truth. About the Last Party. About the end. 

Across time, their stories become joined, and a new chapter in human destiny is revealed.