The Sibunas discover the man in the tank is Robert Frobisher Smythe - what exactly are the adults plotting? Eddie resolves to reveal Denby's true identity. Meanwhile, Jerome tries to win Mara back.

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.