Return to Groosham Grange (also known as The Unholy Grail) is the second Groosham Grange novel written by Anthony Horowitz. It was released on 5 May 2003 as the new edition under the name, Return to Groosham Grange. The first edition by Walker was released in 1999 with the name The Unholy Grail. It serves as a sequel to Groosham Grange (1988).