A dead young man's affair with a beautiful widow brings odd, dangerous events to his grandmother's house.
| Name | Type | Role | |
|---|---|---|---|
| Claudine Auger | Guest Star | Isadora Klein | |
| Peter Wyngarde | Guest Star | Langdale Pyke | |
| Ben Pullen | Guest Star | The Duke of Lomond | |
| Mary Ellis | Guest Star | Mary Maberley | |
| Gary Cady | Guest Star | Douglas Maberley | |
| Caroline Blakiston | Guest Star | Dowager Duchess | |
| Jeremy Brett | Actor | Sherlock Holmes | |
| Edward Hardwicke | Actor | Dr. Watson | |
| Rosalie Williams | Actor | Mrs. Hudson |