Late 70s, USSR. Police Lieutenant Colonel Gordin and Captain Kolesnikov are investigating a failed attempt on the life of a major Soviet pop star. Gordin is sure that his “old acquaintance“ is behind the crime - a ruthless contract killer, whom he nicknamed the Chameleon. At this time, several murders take place in Moscow and the Moscow region, which at first glance are not related. Gordin and Kolesnikov are trying to figure out who and why “ordered” a pop singer to the Chameleon, how all the victims are related to each other and what kind of relationship they had with the artist. So far only Chameleon knows the answers to these questions, who is known in the criminal gang under the nickname Nemchik ...