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The film opens with Cassie (played by Chloë Grace Moretz), armed and determined, as she scavenges through a deserted grocery store. The grave reality of her environment is soon highlighted when she encounters a wounded man. Their tense interaction turns tragic when Cassie, mistaking him for a threat, shoots him. This moment sets the tone for her character's moral ambiguity—highlighting the themes of survival and trust in a world turned upside down.