The dark power of hidden desires is insidious. First capturing, then again losing his prey, Garv follows the trail. The full moon is almost over, and only ominous witchcraft will decide whether the Coastal River destined for him will become a long-awaited gift or a continuation of the ancestral curse. Having miraculously survived a fight with a lake monster, Yeoman stumbles upon Mermaid Tears, which promise to bring the most sacred things to life. He has no idea about the black spells of the Haunted Grotto, which are preparing a cruel retribution for him. On the night of Ivan Kupala, Niov witnesses a witchcraft bathing. The river maiden will not leave him, and trying over and over again to get rid of the obsession, he will understand how the bloodthirsty pool of mermaid spells is sucking him deeper and deeper.