Sorry, Wrong Number by Louise Fletcher

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Sorry, Wrong Number is a radio play by Louise Fletcher's play which originally aired on the Suspense radio program on May 25, 1943. Essentially a one-woman show, Agnes Moorehead starred as Mrs. Stevenson, an imperious invalid who accidentally intercepts a phone call between two men plotting a murder for that evening. Leona Stevenson is a spoiled, bedridden daughter of wealthy businessman James Cotterell. She tries to reach her husband, Henry. The servants have the night off and she is alone in the apartment. She overhears two men planning a murder via what seems to be a crossed telephone connection. The call cuts off without Leona learning much other than it is scheduled for that night, when a passing train hides any sounds. She calls the telephone company and the police, but with few details, they do nothing. She tries to enlist the help of the telephone operator, the police, and a hospital, becoming more frantic as the time passes. The play was reprised seven times (on August 21, 1943, 1944, 1945, 1948, 1952, 1957 and 1960). The final broadcast was on February 14, 1960. Orson Welles called Sorry, Wrong Number "the greatest single radio script ever written". In 2015, the broadcast was deemed "culturally, historically, or aesthetically significant" by the Library of Congress and selected for inclusion in the National Recording Registry.

Source: Wikipedia