After losing both their parents, Bristol Keats and her sisters struggle to stay afloat in their small, quiet town of Bowskeep. When Bristol begins to receive letters from an aunt she has never heard of who promises she can help, she reluctantly agrees to meet—and discovers that everything she thought she knew about her family is a lie. Her father may still be alive, kidnapped by terrifying creatures to the realm from which he originated. Desperate to save her father and uncover the truth, Bristol journeys to a land of gods, fae, and monsters. Pulled into a dangerous world of magic and intrigue, she makes a deadly bargain with the fae king, Tyghan. However, she is unaware that he is the one who drove her parents to a life on the run, and he is just as determined as she is to find her father—dead or alive.