Mía y sus amigos van de excursión a casa de la tía Obdulia, una bruja muy peculiar. Lleva unas gafas enormes, le encanta hacer hechizos para cambiar las cosas de color y reír. Pero en casa de la tía se oyen unos ruidos muy raros que vienen de la buhardilla. Mía decide subir a ver qué hay. ¿Conseguirán ella y sus amigos resolver el misterio sin darse un buen susto? ¡Ven y acompáñala en esta nueva aventura!Mías' parents, Linus and Enchanted Snowflower, are attending the annual Congress of Magic and Witchcraft in Amesbury, near to Stonhenge. In the meantime, Mia stays at her aunt's. Aunt Obdulia is a near-blind old sweet lady. She's is also a super funny and affectionate witch. Perhaps a little too much! She loves to cast spells, colour the food she cooks and dress up Mía's pet friends in colourful clothes and costumes. All except Rosalia, who manages to hide!Lía, who doesn't miss a thing, joins the party for the weekend, until there's a rumble in the attic! Who could it be? Is there a ghost in the house? What will they find up there? Don't panic! It's only Vampi, a small bat, as blind and sweet as its owner, who has lost his glasses.