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Cosy Catastrophe is a type of postapocalyptic tale, usually set on Earth, in which an isolated group of survivors sets about rebuilding a new civilization according to their own particular ideas. (As with the 'cosy mystery' subgenre, unjust death has occurred, but the characters don't get too rattled about it.) The founding example is probably Mary Shelley's less-well-known novel The Last Man. Another is John Wyndham's novel The Day of the Triffids, later filmed by Steve Sekely.