Mara is furious as a heartbroken Joy admits her feelings for Jerome. Eddie calls on Patricia's sister for help with the missing artefact clue and KT is torn as she realises she doesn't know who to trust.
The Sibunas uncover the details of the secret ceremony in a very special place. They rush to rescue Harriet Denby, but discover she's gone. Jerome's love life is in a tangle.
Jerome, Joy, Patricia and Alfie start acting very strangely, as if guided by an unseen force. Jerome is tricked into believing he's been picked for a talent contest. KT wants answers and foolishly goes to the Gatehouse alone.
The adults are on the Sibunas' tail, looking for their second sinner. Patricia plans to tell Eddie how she really feels about him, little knowing that Victor and Denby have trapped him in the crypt.
The Sibunas find Frobisher apparently dead. Jerome is humiliated in front of the class during the singing competition. Victor visits the Gatehouse and is captured by Frobisher as his first sinner.