A night worker at a mental institution finds his job beginning to change.
| Actor | Role |
|---|---|
 Denholm ElliottSwan | Swan |
 Billie WhitelawWendy | Wendy |
 Dennis WatermanRichard | Richard |
 Richard VernonStanley | Stanley |
 Ruth DunningMrs. Trent | Mrs. Trent |
 Michele DotriceVickie | Vickie |
| HHilda BarryMrs. Mullins | Mrs. Mullins |
| AAlfred BellEvans | Evans |
| GGiles BlockJohn | John |
| DDudley JonesBlagden | Blagden |
| KKarin MacCarthyJoan | Joan |