The TV series "Black River" is a Russian detective action film about the mysterious disappearance of an oil workers' brigade in the Siberian forests. The owner of the oil field tries to cover up the accident, but rumors have already started circulating in the nearby town of Belogorsk, and hiding the truth becomes impossible. The police decide not to intervene, as a clear order comes from the capital to bury the case. However, an unconventional employee of "Baikal Oil," Alexey Kovalyov, arrives in Belogorsk, determined to get to the bottom of what happened.