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 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.

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.