Someone is trying to destroy David Eliot's school. A year ago, he'd have been happy to see the end of Groosham Grange and its ghoulish teachers. Now, he's on course to win the Unholy Grail, a cup of magical power presented to the star pupil. But a series of suspicious mishaps sees the gap between David and new boy Vincent King narrow alarmingly. Someone, it seems, is trying to stop David winning - and, worse, threatening Groosham Grange itself!

Anthony Horowitz (born 5 April 1955), is an English author and screenwriter. He has written many children's novels, including The Power of Five, Alex Rider and The Diamond Brothers series and has written over fifty books. He has also written extensively for television, adapting many of Agatha Christie's Hercule Poirot novels for ITV series. He is the creator and writer of the ITV series Foyle's War and the series Midsomer Murders.