Mistress of an evil household

In the remote village of Zhizhitsy, right on the border of the magical kingdom, strange things are happening. A young couple in love mysteriously dies in the forest, and the local policeman sent to investigate the case disappears without a trace. The best detectives of His Majesty: a witch, a fire mage, and a demon, have volunteered to unravel this tragedy and find those responsible for the crime. But what if the locals remain silent or shut the door right in front of their noses? It seems they will have to seek help from those who dwell on the other side of the magical forest. Kelpies, mermaids, swamp creatures, and drow - who else will the detectives have to face in this dark place? And who is she, his mysterious hostess?