Anthony Horowitz's Groosham GrangeEpisode 3: The Seventh SonBBC Radio 7 Duration: 30 minutesFirst broadcast: Fri 7th May 2010, 05:00 on BBC Radio 7Latest broadcast: Tue 16th Nov 2010, 05:00 on BBC Radio 7A schools inspector calls, David makes an escape bid and is then presented with the ultimate choice. Starring Jack Klaff.GenresChildren'sDramaDramaSciFi & FantasySeriesAnthony Horowitz's Groosham Grange Source: BBC Online