Daisy, a troubled American teenager, is sent to the English countryside to stay with her cousins, Edmund, Isaac, and Piper. Initially aloof and withdrawn, Daisy gradually bonds with her cousins and finds solace in the rural landscape. As she falls for Edmund, she starts to relax and enjoy her surroundings, discovering unexpected joys in their carefree lifestyle amidst the backdrop of an impending global conflict.

The world is suddenly upended when a nuclear bomb explodes in London, plunging England into war. The idyllic countryside becomes a dangerous battleground as military forces seize control and families are torn apart. Daisy and her youngest cousin Piper are separated from Edmund and Isaac, forced to navigate the chaotic new reality alone. Determined to reunite with their loved ones, Daisy must summon inner strength and resilience in the face of harrowing challenges and relentless danger.