La Ragazza Che Sapeva Troppo (aka The Girl Who Knew Too Much) (1963)

An American tourist (Leticia Roman) witnesses a murder in the middle of the night but when there's no evidence of a body, the police think it was a product of her imagination. She convinces a young doctor (John Saxon) to help her investigate. Directed by Mario Bava (BLACK SUNDAY), this moderately entertaining B&W thriller is referred to as an early example of the giallo but really, it comes across more like an Agatha Christie style murder mystery (Christie's THE ABC MURDERS comes to mind). It's rather convoluted (that sounds nicer than messy) in its execution. In the film's first 15 minutes, our heroine sees a woman stabbed to death, gets her purse stolen by a mugger, has her unconscious body molested and watches her Aunt suffocate to death! Bava wastes no time! When the murderer is eventually unmasked, the motive makes no sense. In fact, I'm still not sure there was a motive. There's style to spare so one can overlook the senseless plot. With Valentina Cortese and Dante DiPaolo (Rosemary Clooney's husband).