A peaceful evening in the Appalachians turns chaotic when a crash in the Green Mountains releases an alien virus. Marine Valeria Steele must locate her son Alex and his classmates on a school trip and gets caught amid the turmoil. Valeria fights against terrifying monsters mutated by the virus as she searches for Alex. Due to the rapid spread of the virus and the worsening situation, she commences training Alex. She imparts her combat skills and the essential survival techniques required for such circumstances. The novel explores love, sacrifice, and resilience themes, illustrating how the relationship between a mother and son sustains them through various challenges.