Twins Anna and Adam live in an abandoned commune in a volatile landscape where they prepare for the world-ending event they believe is imminent. Adam keeps watch by day, Anna by night. They meet at dawn and dusk. Their only companion is Koan, the commune's former leader who still exerts a malignant control over their daily rituals. But when one of the previous inhabitants returns, everything Anna and Adam thought they knew to be true is thrown into question.