Erin Gracewood has been surrounded by life in the Copper Court her whole life. Blending in has always been essential to her, but it never quite sat right. Erin is a Horizonborn, the child of a human and an angel. And although Horizonborns are revered, Erin must hide her true nature to protect her family's secrets. One day, Lady Viola of the Silver Court arrives. She's like no one Erin has ever met before: bold, outspoken, and effortlessly charismatic. But she carries a message: A marriage alliance between her and the Copper King to finally end years of feuding between the two courts. Erin is suspicious that this might be a coverup for a murderous plot, and she has the power to stop the wedding. But can Erin risk exposing her family's lies for her kingdom? As she battles these challenges, court life forces her and Lady Viola together and soon something grows between them, making her decisions much harder. Even if she does risk intervening, why does she really want to stop the wedding? With her heart pulled in all directions, can Erin balance any more secrets?