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The Loreley's Grasp is a 1973 Spanish horror film written and directed by Amando de Ossorio, and starring Tony Kendall, and Helga Liné. The film centers on a series of horrific murders in a German town by the Rhine river perpetrated by a deadly water spirit known as the Lorelei. The film was released in theaters in the United States under the title The Swinging Monster on August 24, 1976, but most famously a few years later under the title When the Screaming Stops. imdb.com