The events of the series "Taiga Detective. Mammoth Hunt" unfold near a small Mari settlement, where a unique cave with Paleolithic cave paintings is located. Unexpectedly, a group of archaeologists studying the cave is found murdered. The locals believe that a vengeful spirit is responsible, but investigators Tatiana Tretiakova and Alexey Yartsev have a different opinion on the matter. Meanwhile, Tanya is unsuccessfully trying to find the person who killed her father.