Cecilie skips school so she and Hubert can go to Roskilde Cathedral. Here they have to get hold of a key on display, and Hubert distracts the attention while Cecilie steals the key. This gets Hubert caught playing with the church choir, but soon the guard is after both children. In the meantime, Petra has discovered that the exhibition has been tampered with, and Hubert can't remember anything about his family, to Cecilie's surprise.