Four couples gather for dinner the night a mysterious and powerful comet passes overhead. As unexplained events begin to bend reality in frightening ways, the couples realise that visitors from a strange house down the road may be trying to prevent them from surviving the night. As the night unfolds, people experience terrifying revelations about themselves, forcing each one to question their own reality. Relationships strain under the pressure and, for at least one woman, the prospect of continuing on in the house becomes even more unbearable than whatever unknown fate lies down the road.