The long war is over, the soldiers are returning home. What do they bring with them from foreign lands? What curses lie on them, what ghosts follow on their heels, smelling of blood and death? And how will their homeland greet them? What should someone who only knows how to kill do in a peaceful life?...The village of Greenthorpe, an idyllic corner of the old Kingdom, lost among the green hills. There, time itself flows differently, there you can still meet unicorns, goblins and fairies... But her peace is disturbed: one after another, students of the prestigious Greenthorpe School die at the hands of an invisible killer. The main suspect in the case is a young retired officer, Norbert Vetteli, who recently received a position as a science teacher. To prove his innocence, he has to take on the investigation himself. The only trouble is that he himself is so unsure of his innocence...