

Suddenly, last summer, Cathy knew she was being used for something evil!
The only son of wealthy widow Violet Venable dies while on vacation with his cousin Catherine. What the girl saw was so horrible that she went insane; now Mrs. Venable wants Catherine lobotomized to cover up the truth.
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Gary Raymond
George Holly

Mavis Villiers
Miss Foxhill

Patricia Marmont
Nurse Benson

Joan Young
Sister Felicity
Maria Britneva
Lucy
Sheila Robbins
Dr. Hockstader's Secretary
David Cameron
Young Blonde Intern
Grace Denbigh Russell
Asylum Patient (uncredited)
Brenda Dunrich
Nurse (uncredited)

Eddie Fisher
Street Urchin (uncredited)
Frank Merlo
Audience Member at Operation (uncredited)

Sheila Raynor
Mother of Young Patient (uncredited)
Beatrice Shaw
Elderly Lady (uncredited)
Florence Stark
Patient (uncredited)

Julián Ugarte
Sebastian Venable (uncredited)

Gore Vidal
Audience Member at Operation (uncredited)

Rita Webb
Asylum Patient (uncredited)

Ian Wilson
Patient (uncredited)

Roberta Woolley
Nurse (uncredited)