- HD 1080
- Runtime: 86m.
- Status: Released
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- Languages: it
- Country: Italy
- Director: Mario Bava
- Stars: John Saxon, Letícia Román, Valentina Cortese, Dante DiPaolo, Titti Tomaino
- keywords: rome, italy, italy, investigation, tourist, murder, marijuana, serial killer, giallo
- Production_studio: Galatea Film, Coronet s.r.l.
- Slogan: What Does It Want? What Will Satisfy Its Cravings?
- providers: Amazon Prime Video, AMC Plus Apple TV Channel, AMC+ Amazon Channel, AMC+, Criterion Channel, Shudder, Shudder Amazon Channel, Shudder Apple TV Channel, Amazon Prime Video with Ads
- The The Girl Who Knew Too Much is featured in the top rankings of 1963
- #4 in Top Thriller Movies of 1963
- #3 in Top Mystery Movies of 1963
- #4 in Top Horror Movies of 1963
A tourist witnesses a murder and finds herself caught up in a series of bloody killings.