Sybella's duty as Death's assassin in 15th-century France forces her return home to the personal hell that she had finally escaped.
Princess Ko's been bluffing about the mysterious absence of her father, desperately trying to keep the government running on her own. But if she can't get him back in a matter of weeks, the consequence may be a devastating war. So under the guise of a publicity stunt she gathers a group of teens from across the kingdom to crack the unsolvable case of the missing royals of Cello.
Armed with a troll treasure, a book of spells and curses, and a possibly magic hairbrush, Astri and her little sister they set off for America. With a mysterious companion in tow and the malevolent “goatman” in pursuit, the girls head over the Norwegian mountains, through field and forest, and in and out of folktales and dreams as they steadily make their way east of the sun and west of the moon.