Clarissa, the wife of a Foreign Office diplomat, is given to daydreaming. 'Supposing I were to come down one morning and find a dead body in the library, what should I do?' she muses. Clarissa has her chance to find out when she discovers a body in the drawing-room of her house in Kent.
| Actor | Role |
|---|---|
 Penelope KeithClarissa Hailsham-Brown | Clarissa Hailsham-Brown |
 Robert FlemyngSir Rowland Delahaye | Sir Rowland Delahaye |
 Thorley WaltersHugo Birch | Hugo Birch |
 Holly AirdPippa Hailsham-Brown | Pippa Hailsham-Brown |
 Elizabeth SpriggsMildred Peake | Mildred Peake |
 David YellandJeremy Warrender | Jeremy Warrender |
| JJohn BarcroftInspector Lord | Inspector Lord |
| JJonathan NewthHenry Hailsham-Brown | Henry Hailsham-Brown |
 Brian ProtheroeOliver Costello | Oliver Costello |
| DDavid CrosseElgin | Elgin |
| MMark DraperConstable Jones | Constable Jones |
| LLee FoxDoctor | Doctor |