A television producer encounters personal problems while making a documentary about the philosopher Wittgenstein.
| Actor | Role |
|---|---|
 Keith BarronDavid Duncan | David Duncan |
| MMary MillerJenny Duncan | Jenny Duncan |
 Peter BowlesFrank Cordroy | Frank Cordroy |
 Ann LynnMadge Gallagher | Madge Gallagher |
| PPaul SeedChris | Chris |
 John WoodnuttWilliam Duncan | William Duncan |
 Mervyn JohnsLord Beale | Lord Beale |
 Ray BrooksSteve Abelman | Steve Abelman |