- HD 1080
- Runtime: 91m.
- Status: Released
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- Languages: it
- Country: Italy
- Director: Enzo Milioni
- Stars: Barbara Magnolfi, Stefania D'Amario, Anna Zinnemann, Antiniska Nemour, Yvonne Harlow
- keywords: murder, serial killer, whodunit, luxury hotel, giallo
- Production_studio: Supercine
- providers: Troma NOW
- The The Sister of Ursula is featured in the top rankings of 1978
- #49 in Top Thriller Movies of 1978
- #45 in Top Horror Movies of 1978
While searching for their estranged mother, two beautiful sisters, Dagmar and Ursula, arrive at a luxurious seaside hotel. At the same time, a mysterious killer starts murdering promiscuous women in the area.