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Mrs. Stevenson, an imperious invalid, accidentally intercepts a phone call between two men plotting a murder for that evening. She tries to enlist the help of the telephone operator, the police, and a hospital, becoming more frantic as the time passes. Lucille Fletcher's play originally aired on the Suspense radio program on May 25, 1943, essentially a one-woman show with Agnes Moorehead as Mrs. Stevenson.
The play was performed seven more times, on August 21 of the same year and again in 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".