Lilith (1964)

Plot

Set in a private mental institution, Chestnut Lodge in Rockville, Maryland, the film tells of a trainee occupational therapist, a troubled ex-soldier named Vincent Bruce (Beatty), who becomes dangerously obsessed with seductive, artistic, schizophrenic patient Lilith Arthur (Seberg).

Bruce is successful in helping Lilith emerge from seclusion and leave the institutional grounds for a day in the country, and later escorts her on excursions in which she is alone with him. She attempts to seduce him, and eventually Bruce tells Lilith he is in love with her, after which they begin sleeping together. He catches Lilith seducing an older female patient and witnesses her behaving inappropriately with young boys on two of her outings, incidents which greatly disturb Bruce.

Bruce triggers the suicide of another patient (Fonda) out of jealousy over the patient's crush on Lilith. This brings up memories in Lilith of her brother's suicide, which she implies was due to her attempt to initiate an incestuous relationship with him. She goes on a destructive rampage in her room and winds up in a catatonic state. Bruce then presents himself to his superiors for psychiatric help. (wiki)