Karlsvognen.

This film sees children as survivors, courageous in the face of life's bad breaks. Uprooted from a Danish city, Tias, 14, and his kid sister Linda, settle in Sweden where their mother, a perpetual drifter, has decided to give a rural lifestyle a try. The siblings find a new friend in highly musical Tobby, but they also run into enemies and a mysterious neighbor. Is their house maybe haunted?