A man and a woman (both married to other people) are found dead in a show home in what appears to have been double suicide. Their respective children investigate this supposed affair but the surviving spouses seem unaffected
| Actor | Role |
|---|---|
 Anton RodgersTom Lewis | Tom Lewis |
 Annette CrosbieDorrie Childs | Dorrie Childs |
 Jonathan Scott-TaylorSimon Lewis | Simon Lewis |
| SSuzanne BurdenCelia Childs | Celia Childs |
 Larry LambAlbert | Albert |
 John ForgehamInspector Heneker | Inspector Heneker |
 Barbara HicksMrs. Butterworth | Mrs. Butterworth |
| JJean RimmerMarjorie Sims | Marjorie Sims |
| KKeith BartlettSergeant Butt | Sergeant Butt |
| PPatricia PriorMrs. Bannister | Mrs. Bannister |
| MMaggie RileyBarbara Lewis | Barbara Lewis |
| KKenneth GilbertNed Childs | Ned Childs |
 Charles CorkClegg | Clegg |