A fairy tale about a boy, Petruś, a girl, Kasia, a goat, a lion, a horse, and Aunt Iva. Brother and sister come to visit their beloved aunt in a house under the chestnut trees, where amazing adventures happen to them: a kitten turns—right before their eyes—into a magic tiger cub; an old wooden rocking horse comes alive and, together with the armchair’s finial—a lion—invites them to go for a ride; and suddenly the stove door turns into a palace gate…