On suspicion of murders in Russia and Lithuania, two innocent people were simultaneously arrested - drug police officer Alexey Kostin and the head of the detective agency Stas Nesterov. A connection is discovered between their cases - both arrested tried to resist a large pharmaceutical company, whose management is distributing strains of a new dangerous virus. The lives of millions of people are at risk. Russian special services and detective agency employees, colleagues of Kostin and Nesterov, are joining the investigation. Meanwhile, ampoules with the strain are approaching the Russian border...