Fabian's devastated that Nina isn't coming back to Anubis. Eddie's shocked when he recognises new girl, KT, from a vision. He knows she's here on a secret quest. A new teacher moves into the gatehouse.
Amber is accepted to fashion school - will Alfie lose her to America? Fabian decodes some of the cryptic message from the bracelet packaging. Eddie and KT sneak into Miss Denby's house and make a shocking discovery.
As Fabian, Patricia and Alfie search for Amber, KT and Eddie's suspicions about Miss Denby are confirmed. Jerome's sabotage of Mara's business project backfires and Amber learns the adults are planning a mysterious ceremony...
Amber is discovered in the Tank Room and the Sibunas think she's betrayed them all. Eddie and KT are shocked to find a photo of the 'real' Miss Denby but Eddie recognizes her- she's the woman from his vision!
Amber leaves, revealing what she heard in the Tank room and demanding that Sibuna is reformed - they have to stop the adults! Meanwhile Victor is delighted he finally has his bracelet - little knowing it's a fake!
The Sibunas find the real Miss Denby, who has some revelations for them... but will they get away without being caught? Jerome sets his sights on Willow. Joy boosts her confidence with a brand new look.
The Sibunas learn that they must perform the ceremony themselves. With news of a school open day, it's the perfect opportunity to sneak out the tank....or is it? Meanwhile, Jerome's double life catches up with him.
The Sibunas make it to the Crypt with the tank and begin their ceremony - but Denby's discovered Frobisher has gone. Can Sibuna complete the ceremony before the adults find them? Meanwhile, Joy grants Willow a very special wish.
The Sibunas fail to wake Frobisher and are trapped in the crypt with the adults on the warpath. Patricia hatched a rescue plan, but will she manage to rescue her friends? Jerome sweats as roommates Mara and Willow get closer...
Victor confiscates KT's key and when Jerome begs Patricia for a favour she strikes a deal - if he gets their key back from Victor! The Sibunas discover that the adults have special plans for the eclipse... how will they stop them?
The Sibunas learn the history behind the man in the tank and realise they have to stop the ceremony at all costs! Jerome's list of Mara and Willow's pros and cons ends up in Joy's hands - but what will she do with it?
As the eclipse approaches, will Eddie, KT and Fabian get to their friends in time to stop the ceremony? Jerome has a near miss when Joy sends Mara and Willow an incriminating email revealing his secret.
Eddie has a bad feeling something terrible is about to happen. The Sibunas plant secret cameras in the gatehouse and hear a strange voice calling for help. Mara and Willow plot revenge on cheating Jerome.
Eddie has a vision about Frobisher and believes that something very bad is about to happen. At the gatehouse, Frobisher gives Caroline a mission: to find five sinning students to sacrifice to an evil underground Egyptian god, so she picks the Sibunas. The Sibunas are unaware of this until Patricia catches Caroline with their school files. The Sibunas then plant cameras in the gatehouse. They hear a strange voice while watching the cameras and go to investigate. Meanwhile, Mara and Willow get back at Jerome by driving him crazy!
The Sibunas find Frobisher apparently dead - were they wrong all along? 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.
Joy agrees to Mara's ultimate revenge plot - to break Jerome's heart. Meanwhile Mara discovers she is 2nd in line to inherit a Lord's estate. Eddie escapes the crypt and the Sibunas puzzle over how to unlock a mysterious capsule.
The Sibunas puzzle over a riddle which leads them to a secret room. Mara is disappointed to learn she has inherited a dog. Denby drives a wedge between Eddie and Patricia in her quest for Frobisher's next sinner.
Victor discovers the secret room and installs one of Frobisher's fatal booby traps. Miss Denby continues to meddle in Eddie and Patricia's fragile relationship. Joy's persistence finally pays off when Jerome asks her on a date.
Joy and Jerome share a romantic moment during a very strange date. The Sibunas discover a phonograph in the secret room and it's the final straw for Patricia when she finds intimate messages on Eddie's laptop.
KT's hopes of proving her innocence disappear when Harriet is sectioned. The Sibunas search for the artefacts with the help of a family rhyme when the phonograph is mysteriously restored. Eddie faces the real Sibuna traitor.
Willow discovers she's related to Joy and saves the day when she inadvertently provides the clue to a missing artefact. KT decides to run away, leaving Victor without his precious sinner. Fabian learns the truth about Patricia.
When Fabian's trusting nature lands him in the hands of Frobisher, Ammut's collection is almost complete. Meanwhile, Eddie realises the Sibuna traitor is not KT and Jerome shocks Joy with a surprise ending to their play.
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.
Alfie convinces KT that he's not a sinner. They rescue Eddie from Team Evil's clutches - only for Alfie himself to be captured. Joy and Mara are forced to work together when they lose Willow's cherished pet hedgehog.
Eddie and KT find the final artefact and take it to the gatehouse to destroy Ammut - only to realise they have been tricked. 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 on Willow, and realise the purpose of the keys. Jerome explains his feelings to Joy in a letter. But Joy won't read it.
Harriet sacrifices herself as Eddie and KT finally unlock the portal to destroy Ammut and save them all. KT says an emotional goodbye to Frobisher. Joy and Jerome have Mara's blessing, and Alfie has a special gift for Willow.
A fable states that whoever builds the pyramid of Ra will be rewarded with gold but get it wrong and they all pay the price. When a mysterious stone arrives, someone's willing to take that risk. The power of the stone causes chaos, but there's one person who can stop it. (Will they sacrifice themselves to save them all?)