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Groosham Grange is a 1988 fantasy novel by English author Anthony Horowitz and the first novel in the Groosham Grange series. It follows the adventures of twelve-year-old David Eliot, who gets sent to a mysterious school called Groosham Grange and where he eventually learns he is the seventh son of a seventh son. Aimed at a similar audience of that of Horowitz's The Diamond Brothers series, it was partially based on the years Horowitz himself spent at his boarding school and his own unhappy childhood. This book went on to win the 1989 Lancashire Children's Book of the Year Award. and later the French Prix Européen du Roman Pour Enfants ("European Award for Children's Fiction") in 1993. In 1999, a sequel entitled The Unholy Grail (later reissued as Return to Groosham Grange), was released. Horowitz had always intended for Groosham Grange to be the basis for a series, but he revealed to a fan on Twitter in 2021 that while he did indeed have plans to continue the series with a third book, he was dissuaded after the success of the Harry Potter series.