Amanda and Clay head to a remote corner of Long Island expecting a holiday: a quiet reprieve from life in New York City, quality time with their teenage son and daughter, and a taste of the good life in the luxurious home they’ve rented for the week. But a late-night knock on the door breaks the spell. Ruth and G.H. are an older couple – it’s their house, and they’ve arrived in a panic. They bring the news that a sudden blackout has swept the city. But in this rural area – with the TV and Internet now down, and no phone service – it’s hard to know what to believe. Should Amanda and Clay trust this couple – and vice versa? What happened back in New York? Is the holiday home, isolated from civilisation, a truly safe place for their families? And are they safe from one another?