A widowed teacher marries again, but her hopes of her daughter accepting a stepfather her own age, and her anticipation of a birthday picnic by the river are clouded by a series of murders in the district and by a fear rooted rather nearer home.
| Actor | Role |
|---|---|
 Billie WhitelawMargie | Margie |
 Iain GlenRay | Ray |
 Brenda FrickerRay's Mother | Ray's Mother |
 Sarah-Jane HolmDella | Della |
 Cassie StuartRuth | Ruth |
| PPhil SmeetonMick | Mick |
 Jimmy YuillMan at Dyke | Man at Dyke |
| JJulie McDonaldProstitute | Prostitute |
 Ross KempPolice Officer | Police Officer |
| TTrevor PeakePolice Officer | Police Officer |
| RRobert PetersReporter | Reporter |
| JJoan SpallRegistrar | Registrar |
 Peter WhitbreadInspector Cartwright | Inspector Cartwright |
| CChristopher PooleKerb Crawler | Kerb Crawler |
| SSimon WakefieldBoy fishing | Boy fishing |