La sombra sobre la reina de Halloween (Pesadilla antes de Navidad)

As queen of Halloween Town, Sally has saved her home from destruction twice. However, the sinister villain responsible for the town's most recent troubles remains at large, and Sally won't rest until she and her king, Jack Skellington, stop him once and for all. But her enemy makes the first move: her friends begin to disappear, and soon after, Jack vanishes as well. Determined to save the love of her life and protect her home, Sally seeks the aid of the powerful Dark Mare, a mythical being who sends her on a quest through the unpredictable City of Chance, the twisted Labyrinth of the Outlands, and beyond. Soon, Sally discovers that her nemesis is a powerful prince from a place called Shadow City, seemingly intent on destroying Halloween Town forever. But the key to defeating him may lie hidden in secrets from Sally's own past… and uncovering them could shatter the happy life she has fought so hard for.