Liana and Alexa (Barbie and Teresa) are best friends who share everything, including their love of singing. One day while walking through the forest home from the village, the girls meet an old beggar who gives them a magical mirror. As they clean the mirror and sing, a musical apprentice muse named Melody appears in the mirror’s surface, and tells the girls about the secret of the Diamond Castle.

On Christmas Eve, Kelly is reluctant to go to a Christmas Eve ball, so Barbie tells her the story of Eden Starling, a glamourous singing diva in the Victorian England and the owner of a theatre house. However, Eden is self-centred and loves only herself. She is frequently accompanied by her snooty cat, Chuzzlewit. She does not believe in Christmas and orders all her employees to work on Christmas.

In her first animated musical featuring seven original songs, Barbie comes to life in this modern re-telling of a classic tale of mistaken identity and the power of friendship. Based on the story by Mark Twain,