Vincent Bruce, a war veteran, begins working as an occupational therapist at Poplar Lodge, a private psychiatric facility for wealthy people where he meets Lilith Arthur, a charming young woman suffering from schizophrenia, whose fragile beauty captivates all who meet her.
| Actor | Role |
|---|---|
 Warren BeattyVincent Bruce | Vincent Bruce |
 Jean SebergLilith Arthur | Lilith Arthur |
 Peter FondaStephen Evshevsky | Stephen Evshevsky |
 Kim HunterDr. Bea Brice | Dr. Bea Brice |
 Anne MeachamMrs. Yvonne Meaghan | Mrs. Yvonne Meaghan |
 Jessica WalterLaura | Laura |
 Gene HackmanNorman | Norman |
 James PattersonDr. Lavrier | Dr. Lavrier |
| RRobert ReillyBob Clayfield | Bob Clayfield |
 René AuberjonoisHowie (uncredited) | Howie (uncredited) |
| JJeanne BarrMiss Glassman (uncredited) | Miss Glassman (uncredited) |
| MMaurice BrennerMr. Gordon (uncredited) | Mr. Gordon (uncredited) |
| BBen CarruthersBenito (uncredited) | Benito (uncredited) |
 Olympia DukakisPatient (uncredited) | Patient (uncredited) |
 Edith FellowsPatient (uncredited) | Patient (uncredited) |
 Alice SpivakLonely Girl (uncredited) | Lonely Girl (uncredited) |
| TTina PinePatient (uncredited) | Patient (uncredited) |