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 | Bob Kellett | Writer |
| Writing | Timothy Prager | Writer |
| Writing | Lewis Gilbert | Writer |
| Writing | James Herbert | Novel |
| Production | Joyce Nettles | Casting |
| Production | Lewis Gilbert | Producer |
| Lighting | Norman Smith | Gaffer |
| Costume & Make-Up | Jane Robinson | Costume Design |
| Editing | John Jympson | Editor |
| Art | John Fenner | Production Design |
| Camera | Don Lord | Camera Operator |
| Art | Gary Tomkins | Art Direction |
| Sound | Dina Eaton | Music Editor |
| Costume & Make-Up | Christine Beveridge | Key Hair Stylist |
| Costume & Make-Up | Candy Paterson | Costume Design |
| Costume & Make-Up | Marilyn MacDonald | Makeup Artist |
| Sound | Debbie Wiseman | Music |
| Directing | Ann Edwards | Script Supervisor |
| Camera | Tony Pierce-Roberts | Director of Photography |
| Production | Phyllis Huffman | Casting |
| Camera | Keith Hamshere | Still Photographer |
| Visual Effects | Peter Hutchinson | Special Effects Supervisor |
| Visual Effects | Robert Duncan | Visual Effects Supervisor |
| Art | Brian Ackland-Snow | Production Design |
| Production | Anthony Andrews | Producer |
| Art | Peter James | Set Decoration |
| Crew | Pamela Devis | Choreographer |
| Crew | Lisa Hoyle | Stunts |
