When a poisonous article about Nina appears on the school website, speculation is rife about the identity of the school's phantom blogger. In order to save Vera, Victor hatches a plan and leaves his reflectors in his office, knowing that Sibuna will snoop around and find them when he goes out. The gang succeeds in finding the objects, and Fabian also finds Victor's completed zodiac, along with a list of where he believes the remaining reflectors are. Alfie and Amber go into the attic to retrieve the reflector from the stained glass window but, unaware that Vera is still catatonic nearby (concealed beneath a blanket by Victor), they accidentally reveal the existence of the passage between the tunnels and the library.

Joy tries to apologize to Nina, who is upset over Gran being cursed, but the gang isn't having it and they freeze Joy out. Sibuna realizes that in order to complete the task, they will have to borrow a "Sibuna temp" to hold the sixth reflector, so Patricia hatches a plan to bring a blindfolded Eddie into the tunnels under the pretense of a "date." Sibuna and the oblivious Eddie manage to complete the task and enter the final chamber.

The Sibunas realize they must play the ancient Egyptian game of Senet - and the stakes are high. Joy is still getting a hard time because of Mara, so when Mr Sweet tells her to enter Mara in the blog competition, Joy makes other plans. Trudy is having strange dreams - could her memory be returning? Victor and Vera secretly practice Senet in his office, while the Sibunas meet Jasper who tells them Rufus knows he's been tricked, and he does it soon after the Sibunas find the rules on a mismatched tile on the library floor. Jerome finally makes his move on Mara, only to discover she's still not over Mick. Down in the tunnels, disaster strikes when Nina moves to the wrong square and the floor gives way beneath her.