David spies some paper and picks them up and sees that they are the questions for the "Advanced Cursing" test he is supposed to take the next day. Just as he is putting them down, the office door flies open and Mr. Helliwell caught him. David loses fifteen points, and now Vincent is right behind him in the race for the top prize, with just a lead of one point. Finally, the "Advanced Cursing" test takes place and Vincent scores one mark higher than him and that settles the score and there's a tie. The correcting teacher, Mr. Kilgraw says that he didn't write one full answer and David is alarmed as he's sure he wrote it. Then, there's a tie-breaker where a blue statuette of Miss Pedicure (another teacher) needs to be recovered from the British Museum without any use of magic. In the end, he manages to solve the cryptic message given by Mr. Kilgraw and finds it. But at the end, wax models from Madame Tussauds attack him and he loses the statuette. Later, he discovers that Vincent got the statuette. Therefore, Vincent's declared the winner of the Unholy Grail. As usual, he suspects Vincent of treachery as he believed Vincent made those wax models to attack him. When David does finally get into the tower, he finds evidence which claims that someone is trying to destroy Groosham Grange. The agent's plan is to take the Unholy Grail off the island and then to Canterbury which will cause the school to destroy itself. He also sees homing bats in the tower - which he deduces must be sending secret messages to the Bishop of Bletchley. While he's reading, he's suddenly pushed from the window, however he survives as he gets tangled in some vines growing on the walls of the East Tower. David realizes that he must prevent the destruction from happening. On the day of prize-giving, Vincent is finally awarded the Grail, but as soon as the parents leave from the prize-giving ceremony, sudden destruction occurs. And David thinks Vincent is responsible. So, he ventures into the tower to find out what's happening but then is captured by the agent. Then he finds himself face-to-face with Jill Green, his best friend and Vincent King, his rival. He's ashamed to find that Vincent had not been responsible for anything. The only reason he entered the tower that