Among the gravel swamps, in the mansion of businessman Barskov, a frogmeat merchant, terrible things happen. Anna Somova, who has the ability to fight evil forces, is the last hope of an unhappy businessman. And in the mansion, as well as in the whole district, it is really unclean . A couple of centuries ago, as Anna finds out, an innocent soul was lost here, so these places are cursed. The forces of evil rule over them... Anna tries to fight, but Barskova can not be saved. He... shot himself on his birthday.. Death comes to Anna herself. And then, riding a raven horse, she rushes for help to an old hermit who lives in the swamps...