One Dark Window by Rachel Gillig is a dark fantasy novel that follows Elspeth, a young woman cursed with strange visions after being possessed by a mysterious spirit known as the Nightmare. Living in a kingdom where magic is tightly controlled, she must learn to navigate her dangerous powers while aiding a group of rebels aiming to dismantle the oppressive rule over magic users. With lush prose and atmospheric world-building, the story is a blend of suspense, romance, and dark enchantment. One Dark Window, Rachel Gillig, dark fantasy, magic, possession, rebellion, suspense, romance