Summer evening at 10 o'clock. The sun sets from the Place de la R é publique in Paris, and Lucy and Leo begin a battle; “urbex”；， Dive deep into the abandoned underground networks of the city. These two teenagers shared their adventure experiences in real-time on social media. On the subway platform, two young lawyers are on their way to meet their friends. They filmed themselves while waiting for the train. Nora and Gabrielle just had sex. When he went to work, she went to see a friend in the evening. They don't know yet, but in a moment, the terrorist attack will change their lives and forever link their destinies together. After a while, they will enter the darkness. The novel unfolds through three synchronized video streams, which are filmed on mobile phones and can be watched by everyone through social media. By switching from one summary to another, the audience discovers three narratives of an ensemble movie. From the excitement of that moment, the comments of the fans, to the loss of signal, the audience was immersed in multiple...