Mankind is infected by a mysterious virus. After death, people first become “resurrected” zombies, and then turn into “quaZis.” QuaZis are fast, strong, and resilient; they lack thirst for blood and their cell regeneration is enhanced. The world reached between humans and quaZis is strange and fragile. And when a state security employee, Denis Simonov, is urgently called from Moscow to Saint Petersburg on a vital assignment, he quickly realizes that the outcome of his mission will determine the fate of the entire world. A truce between humans and quaZis hangs by a thread—and if that thread snaps, there will be no winners in the unleashed war.