A supposedly fake medium is hired to a conduct a séance so Sir Alington, a psychiatrist, can observe a patient under stress. She warns the doctor, Clair and her husband Jack to avoid their homes because they are in danger. Her premonition turns out to be true because of insanity, murder, and secret loves.
| Name | Type | Role | |
|---|---|---|---|
| Agatha Christie | Writer | ||
| Reginald Denham | Writer | ||
| Mary Orr | Writer | ||
| Tom Helmore | Guest Star | ||
| Noel Leslie | Guest Star | ||
| Beatrice Straight | Guest Star | ||
| Isobel Elsom | Guest Star | ||
| Peter Cookson | Guest Star | ||
| Ian Martin | Guest Star | ||
| Philippa Bevans | Guest Star | ||
| Robert Stevens | Director |