Return to Groosham Grange is a fantasy novel written by English author Anthony Horowitz and the second novel in the Groosham Grange series. It was first published in 1999 under the name The Unholy Grail, but was then reissued in 2003 under the new name, Return to Groosham Grange. This change in the title was done to help link the two books together. Return to Groosham Grange serves as a direct sequel to Groosham Grange and mainly revolves around a plot concerning a secret agent of the Bishop of Bletchley trying to destroy Groosham Grange once and for all. A second sequel was planned, but Horowitz changed his mind after the success of the Harry Potter series. Source: Wikipedia (en)