On the morning of her twelfth birthday, Lin Xiaoman discovers that every adult has vanished without a trace. The city descends into chaos: planes crash on runways with no one at the controls, hospitals are left with nothing but crying child patients, and older children violently loot the supermarkets. In this world that has suddenly lost all its rules, she must rely on the survival skills her father taught her and lead survivors of different ages in staying alive.
When the gifted girl Chen Xing cracks the mysterious USB drive's "Ark Project," they discover that the adults' disappearance was part of an experiment. As violent gangs begin enslaving weaker children and the power grid gradually fails, Lin Xiaoman's group must choose between uncovering the truth and preserving civilization. Most devastating of all, in an abandoned laboratory they uncover a suffocating truth: this disaster may have been the adults' final sacrifice to save the next generation...
