Li Zhe, an emergency-room doctor finishing a grueling overnight shift, has just dealt with a violently agitated patient.
An ambulance brings in an entire special forces unit, every member bearing wounds that ooze a strange green fluid.
Thirty seconds after the attending physician is bitten, his blood vessels burst. His eyes roll back as he lunges at a nurse.
A terrified intern knocks over the equipment cart, the clatter of metal sounding like the overture to the apocalypse.
As Li Zhe flees toward the stairwell, the lights on the entire floor go out.
In the darkness, he pulls out his phone. His wife has sent one last message:
“Don’t come home! The lab... it’s all over...”