Professor David Ash exposes false spiritulists and mediums. He is invited to Edbrook to resolve the fears and torments within its secretive family. Soon after arriving Ash begins to doubt his own senses, and watching the strange behaviour of its residents does not make his task any easier. In time, he finds there's more to Edbrook than even he can debunk.
| Directing | Lewis Gilbert | Director |
| Writing | Lewis Gilbert | Writer |
| Writing | Bob Kellett | Writer |
| Writing | Timothy Prager | Writer |
| Writing | James Herbert | Novel |
| Directing | Ann Edwards | Script Supervisor |
| Camera | Keith Hamshere | Still Photographer |
| Camera | Don Lord | Camera Operator |
| Costume & Make-Up | Marilyn MacDonald | Makeup Artist |
| Art | Brian Ackland-Snow | Production Design |
| Production | Lewis Gilbert | Producer |
| Sound | Dina Eaton | Music Editor |
| Lighting | Norman Smith | Gaffer |
| Costume & Make-Up | Christine Beveridge | Key Hair Stylist |
| Sound | Debbie Wiseman | Music |
| Costume & Make-Up | Jane Robinson | Costume Design |
| Costume & Make-Up | Candy Paterson | Costume Design |
| Camera | Tony Pierce-Roberts | Director of Photography |
| Visual Effects | Peter Hutchinson | Special Effects Supervisor |
| Visual Effects | Robert Duncan | Visual Effects Supervisor |
| Art | Gary Tomkins | Art Direction |
| Production | Joyce Nettles | Casting |
| Production | Phyllis Huffman | Casting |
| Art | John Fenner | Production Design |
| Editing | John Jympson | Editor |
| Production | Anthony Andrews | Producer |
| Art | Peter James | Set Decoration |
| Crew | Pamela Devis | Choreographer |
| Crew | Lisa Hoyle | Stunts |
