Leningrad in 1942, during the Second World War. The Institute for Experimental Medicine is destroyed, apparently during an air raid, and subsequently vessels containing viruses disappear. These have the potential to trigger an epidemic once the extreme weather conditions pass, and spring is only around the corner. Thus begins a race against time.
Lieutenant Volodya has 72 hours to locate the substances in the besieged city and thus save his country from falling victim to a disaster that will surely prove decisive in the outcome of the war. It soon comes to light that the disappearance is in fact part of a well-planned act of sabotage committed by collaborators with the aim of annihilating the population. Doctor Olga Sergeyevna, a researcher at the institute before the outbreak of the war, is enlisted by Volodya as an infection specialist, only for her to fall into the clutches of the NKVD.
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