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is sure that it is a murder, because shortly before his death, the grandfather promised to reveal a secret that he had kept for many years. However, Burmistrov's daughter, Valentina, believes that the old man was killed by a thief who stole an old painting from the apartment. Detectives contact Kirill Markov, a worker at a local factory who has recently been seen with the deceased. In Kirill's dormitory, the chief's assistants found the missing painting. What connected a simple and uneducated guy and a university professor?