A changeling with a secret. A princess locked in a tower. A knight intent on rescuing her. This isn't the fairytale you've heard before. Aster Lemorque is a girl of many faces. She comes from a long line of changelings, distrusted by the common folk of Belforet as evil fairy shapeshifters. Her family run the Maison du Lemorque, a decoy service that provides a changeling who can take the place of someone who would rather be elsewhere - for a hefty fee, of course. Aster is shocked when Princess Adaliza of Belforet asks for her help. The king has ordered that Adaliza, his sole heir, should be locked up in a tower in the depths of the forest to keep her safe from the oncoming plague - an order that the headstrong princess has no intention of following. They require a changeling to take Adaliza's place in the tower, and Aster is assigned the job. Everything is going to plan until a young knight climbs the tower to rescue the princess and Aster finds herself caught in a conundrum. She has to find the real Adaliza in time for the princess to marry the knight and ascend the throne. And she definitely, unquestionably, categorically shouldn't fall in love with Sir Finton Prest herself ...