Experiment in Terror was released in the year 1962。Experiment in Terror is also called as Stemmen i mørket, Operazione terrore, Mercader del terror, Mercader de terror, Kestävyyskoe, Kauhun lunnaat, Chantaje contra una mujer, brigade spéciale, Allô, Letzte Zug。
Kelly Sherwood is terrorized by a man with an asthmatic voice who plans to use her to steal $100,000 from the bank where she works. He threatens to kill her teenage sister Toby, if she tells the police. However she manages to contact F.B.I. agent Ripley.