His most famous work is Ghostwatch, a controversial drama shown on BBC One on Halloween 1992. It is commonly misrepresented as a hoax documentary, but this was never the intention. It was originally planned as a six-part series for the BBC. However, the producer of the seven-part series, Ruth Baumgarten, didn't believe it had commercial viability. Stephen reworked the script so that everything would be set "Like episode six" and repitched it as a 90-minute live broadcast drama on behalf of BBC's Screen One drama segment. Ruth accepted the new format. Volk's work often involves the supernatural and the paranormal, such as with the ITV1 thriller series Afterlife (2005–06).