Agatha Sever, a successful, ironic, and perceptive master of the detective genre, is going through difficult times. Both in her writing and in her personal life. She has long found her home on a small northern island, but even there she cannot find inner peace. Nor is there any peace to be found around her. Agatha’s new private investigation is a terrifying wedding commotion that has stirred up the island. Her assistant, the beautiful Marusya, returns from the “mainland,” preparing to get married. Before the wedding, the young couple pays tribute to folk traditions and searches for their magical “karsikko” tree. To everyone’s confusion, the guests see a rune on its trunk signifying death. The bad omen soon turns into real murders, and Agatha must find out where the evil comes from—from ancient dark forces or from familiar people?