A small detachment of soldiers and a handful of civilian representatives of the human race, who managed to survive miraculously against the background of post-apocalyptic events occurring on the earth's surface, are trying to survive in a bunker, carefully hidden from external influences, located underground. Hidden from the deadly threat, people hiding until they invent a vaccine to prevent the transformation into horrendous zombies. It was not the first deadly year for the inhabitants of the planet, captured by bloodthirsty, walking dead, constantly experiencing a thirst for fresh flesh. Among the survivors was a young girl, in former times a student of a medical university. She tries to find a way to heal infected individuals, returning to her former life, but so far to no avail. To organize a real, research laboratory, you need a variety of ingredients that are difficult to obtain under these conditions of complete ruin. Still need special equipment and prototypes of all kinds of chemical compounds. Despite the almost hopeless situation, the voluntary prisoners continue to purposefully seek the way out, trying to find non-ordinary ways of solving the problem, analyzing the chain of successive events preceding the apocalypse. Trying in this way to find the starting point, indicating the true cause of the mass tragedy that occurred. The existence of a girl is much more complicated when a person who plays a negative role in her past appears on the horizon. Now he is infected and begins to turn to a zombie, his presence is very dangerous and unpredictable for others.