The Russian multi-series detective "Altar of Tristan" is the story of a talented artist named Alexandra Korzukhina. She conducts an investigation into a series of "theatrical" murders. Sasha has to deal with mysterious deaths that occur within the walls of the theater. The only clue is a portrait of a mysterious woman. Sasha goes through a difficult period both professionally and personally, leading to depression. But, as often happens, the dark times will be replaced by brighter ones, and everything will turn out for the better.