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.

Anubis House battle Isis House in a Dodgeball Tournament. Harriet Denby escapes from the gatehouse and KT discovers that there's an easier way into the secret room.