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The quiet domesticity is shattered when Rocco, their loyal dog, grows restless, sensing impending doom. This incident awakens the primal instincts within Paul and his sons as they brace to defend their home when creatures attempt to breach the door. Their initial encounter with these monstrous beings hints at an unsettling intelligence, as they strategize during subsequent attempts, leading to newfound fears and strategies for survival.

During a search for supplies to fortify their home, Paul learns of Joseph's desire to build a vehicle, a symbol of their yearning for freedom amidst confinement and fear. Their relationship showcases the generational struggle in adapting to a world turned upside down, as the boys wrestle with their identities in a landscape filled with lurking dangers.