In the third installment of The Princess Switch Trilogy, identical royals Queen Margaret and Princess Stacy team up with their sketchy look-alike cousin Fiona to retrieve a priceless Christmas relic stolen from them. As they track down the thief, Fiona must confront her unrequited feelings for her ex-boyfriend Peter, who has helped her in her quest. With the help of Peter's expertise, Fiona charms a suave and sophisticated master thief into giving her an invitation to his estate, leading to a series of daring heists and double-crosses. In the end, love and forgiveness prevail as Margaret and Stacy are reunited with the Star of Peace, while Fiona finds a second chance at happiness with Peter.