"These Hollow Vows" features Brie, who despises the Fae and avoids them at all costs, even facing starvation. However, when her sister is taken by the cruel king of the Unseelie court to settle a debt, Brie is determined to save her. To do so, she agrees to the king's demand to steal three magical artifacts from the Seelie court. Posing as a bride candidate for Prince Ronan of the Seelie court, Brie finds herself unexpectedly drawn to him, but she remains focused on her mission with assistance from a group of Unseelie rebels led by the enigmatic Finn. As she becomes entangled in the affairs of both courts, Brie must navigate her complex feelings and decide where her loyalties truly lie.