Strange things are happening at an English boarding school called House of Anubis. Popular student Joy goes missing, the school's cranky caretaker has a creepy stuffed crow and the school's attic may be haunted. When recent American transplant Nina gets thrust into the school during this time, she decides to investigate along with her new friend, Fabian, and housemates.
The Sibunas find the real Miss Denby, who has some revelations for them. Jerome sets his sights on Willow. Joy boosts her confidence with a brand new look. (S3, ep 12)
The Sibunas uncover the details of the secret ceremony. They rush to rescue Harriet Denby, but discover she's gone. Jerome's love life is in a tangle. (S3, ep 13)
The Sibunas learn that they must perform the ceremony themselves. Is the open day a good opportunity to sneak out? Jerome's double life catches up with him. (S3, ep14)
The Sibunas make it to the Crypt and begin their ceremony - but Frobisher has gone. Can Sibuna complete the ceremony before the adults find them? (S3, ep15)
The Sibunas fail to wake Frobisher and are trapped in the crypt. Can Patricia rescue her friends? Jerome sweats as Mara and Willow get closer. (S3, ep16)
Victor confiscates KT's key. When Jerome begs Patricia for help she strikes a deal. The Sibunas discover that the adults have plans... how will they stop them? (S3, ep17)
Mr Sweet steals the bracelet from Eddie and a revelation leaves Sibuna stunned. Jerome worries that Mara and Willow working together will threaten his secret. (S3, ep18)
The Sibunas learn the history of the man in the tank and must stop the ceremony! Jerome's list of Mara and Willow's pros and cons ends up in Joy's hands. (S3, ep19)
As the eclipse approaches, can Eddie, KT and Fabian reach their friends? Joy sends Mara and Willow an incriminating email revealing Jerome's secret. (S3, ep20)
Frobisher wakes up - but is he good or evil? Joy tells Willow and Mara about Jerome's two timing. Victor and Denby force Mr Sweet to take drastic action. (S3, ep21)
Willow inadvertently provides the clue to a missing artefact. KT runs away, leaving Victor without his sinner. Fabian learns the truth about Patricia. (S3, ep 34)
When Fabian's trust lands him in the hands of Frobisher, Ammut's collection is almost complete. Meanwhile, Jerome shocks Joy with a surprise ending to the play. (S3, ep35)
Mara is furious as Joy admits her feelings for Jerome. Eddie asks Patricia's sister for help, and KT is torn as she realises she doesn't know who to trust. (S3, ep36)
Alfie convinces KT that he's not a sinner. They rescue Eddie from Team Evil's clutches. Joy and Mara work together when they lose Willow's cherished pet hedgehog. (S3, ep37)
Eddie and KT find the final artefact and take it to the gatehouse to destroy Ammut. An evil Alfie breaks Willow's heart, and Joy and Mara bond while coming to her aid.
As Ammut begins to form, Frobisher demands KT's key - but where is it? Eddie and KT find it, and realise the purpose of the keys. Jerome explains his feelings to Joy.
A sacrifice is made as Eddie and KT try to unlock the portal to destroy Ammut. KT says an emotional goodbye to Frobisher. Alfie has a special gift for Willow. (S3, ep 40)