
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.

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)