An American tourist who enjoys mystery novels sees a murder in Rome and soon finds herself and her suitor involved in a series of murders.
The Girl Who Knew Too Much (La ragazza che sapeva troppo) is a 1963 Italian giallo film. Directed by Italian filmmaker Mario Bava, the film stars John Saxon as Dr. Marcello Bassi and Letícia Román as Nora Davis. The plot revolves around a young woman named Nora, who travels to Rome and witnesses a murder. The police and Dr. Bassi don’t believe her since a corpse can’t be found. Several more murders follow, tied to a decade-long string of killings of victims chosen in alphabetical order.