Disa and her father are on a journey to a place behind the Black Castles – a long and dangerous journey! Now Disa has to find her sister and free her with the brimstone-buttercup. At the End of the World, Disa faces new challenges. The brimstone-buttercup gets so hot that she loses consciousness when she faces her mother's frozen trophies. Will Disa and the brimstone-buttercup be able to lift the curse? And will she overcome her mother's power? Disa in the Land of the Northern Lights Disa and the Hidden People Disa's Battle