With John Saxon, Letícia Román, Valentina Cortese, Titti Tomaino, Luigi Bonos, Milo Quesada, Milo Quesada, Robert Buchanan, Marta Melocco, Gustavo De Nardo, Lucia Modugno
The Girl Who Knew Too Much 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.
The Girl Who Knew Too Much is considered to be the first giallo film, a film genre with a mixture of thriller, sexploitation and horror conventions. This was Bava's last film shot in black-and-white.