That final image of Yu Molan and Lin Zhixi staring at each other in the dark, wondering if the scream they heard was human, but not daring to check. That's the moment the new world order is established. Before, you would call the police or go help. Now, you stay quiet, grip your knife, and hope whatever made that sound doesn't come up the stairs. The transformation from citizen to survivor is complete. And I'm desperate to read what happens next.