Amber is temporarily blinded by a strange beacon that is apparently a trap. Nina and Fabian discover the only thing that can protect them from the beacon: the amulets. Nina and Fabian explore the first task, set by Sarah's father, Robert Frobisher-Smythe, in the tunnels. The answer lies in some old tomes, but one is missing. Jerome reads a letter to his mum from his father and makes a shocking discovery. Anubis House is assigned a new housemother, named Vera, and she appears to be more suspicious than anyone.

A new boy, Eddie, arrives and instantly makes an enemy in Patricia. Amber surprises Nina by finding something that Nina has been looking for. While Jerome plans to scam some money out of his classmates, Vera, the new house mother, and Jasper have a secret meeting. Eddie causes trouble at Jerome's fundraiser, and things become worse when Mara figures out that the entire fundraiser is a scam. That night, Senkhara invades Amber's dreams and attempts to mark her as well.

Nina and Fabian puzzle over the mysterious cube that they have found in the tunnels, but it falls into the wrong hands. Soon, Jasper steals it for the Collector, his apparent patron. Nina figures out how to make the mysterious cube into a key to unlock the first door in the tunnels, and, soon, Sibuna faces their next task. A deadly endeavor that involves potentially fatal traps.