In the hospital where doctor Agniya Smolskaya works, something strange is happening. Over the past two weeks, more than two dozen people have died there from a seemingly harmless acute respiratory infection. There are suspicions that this is a new strain of influenza that is not affected by conventional drugs and antibiotics. The infection is gradually seeping into other medical institutions in the city, but Agnia understands: the root cause is still in her hospital. We must not allow the epidemic to spread! The Medical Investigations Department is tasked with understanding the causes of the virus and finding those who benefit from the deaths of innocent patients. It turns out that there are actually two pathogenic viruses, and one of them was created artificially. Now Agnia is directly interested in the discovery of a vaccine, since she herself finds herself in a hospital bed with fatal symptoms...