Father and mother discover Cecilie has been truanting and they forbid her from seeing Hubert again. But Hubert gets Cecilie out and together they go to Ringsted Church. Here Cecilie is discovered when she wants to make a copy of the key, but Hubert distracts attention and escapes over the church ceiling. Back home, Ib has a copy of the key made while Petra tells about the excavation. And Cecilie discovers the key is a map that shows the entrance to the dungeon.