Once every 28 years, at the great Festival of Lights, the princes of the elven tribes swear allegiance to their queen. Emerelle had no doubt that the Swan Diadem would be placed on her brow again, but... suddenly burning arrows flew towards Emerelle’s ship. It's trolls attacking! Faithful protector Ollowein brings his wounded queen to the human world. But what can people oppose to the power and fury of the trolls, their military cunning, their blood magic?..