Nora Davis (Leticia Roman) jets away to Rome to vacation with Edith, an old friend of her family. Unfortunately, her trip is anything but relaxing On the first night, Edith dies--and as Nora runs into the night for help, she becomes an eyewitness to murder as she sees a woman stabbed to death on the Piazza di Spagna! Being a young woman with an insatiable appetite for murder mysteries, Nora can't get anyone to believe her story, but with the help of the attentive Dr. Marcello Bassi (John Saxon), she learns that a murder did occur on that very spot--10 years earlier--when Emily Craven fell victim to the "Alphabet Murderer"! What did Nora Davis really see, and who is stalking her through Rome? Could it be the Alphabet Killer, looking for Victim D? Mario Bava's "The Girl Who Knew Too Much" is a stylish homage to the "Americans Abroad" thrillers of Alfred Hitchcock. Originally released in America (in greatly revised form) as "Evil Eye," Bava's innovative thriller is presented here--for the first time--in its original director's cut.