Suddenly, Last Summer

Suddenly, Last Summer is a movie starring Elizabeth Taylor, Katharine Hepburn, and Montgomery Clift. A surgeon is assigned the case of a young woman whose aunt wants her lobotomized to cover up a family secret.
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.