" Polunochnitsa,” she said, drinking. Vasya jerked back in alarm. Solovey, watching, pinned his ears. Vasya’s nurse, Dunya, had told tales of two demon-sisters, Midnight and Midday, and none of those stories ended well for lonely travelers. “Why are you here?” Vasya asked, breathing fast. "

― Katherine Arden , The Girl in the Tower (The Winternight Trilogy, #2)