Petra and the computer expert are looking for the things Cecilie deleted from the surveillance tape. Cecilie lies to her parents again and takes Hubert to Kalundborg Church. Here the two help clean the church while desperately searching for a clue. On the way home, they go into Kollinus' shop and here Hubert finds a clue in the front of a letter from Margrete. At home, Petra has discovered who was in the exhibition and tampering with the objects.