Miranda (1948)

While on a fishing holiday to Cornwall, England, Harley Street specialist Dr. Paul Marton (Griffith Jones) is rescued from a watery grave by a rather unusual creature – a mermaid named Miranda (Glynis Johns). Excited by her catch, Miranda threatens to keep him in her cave unless he takes her to London for a holiday, reluctantly Marton agrees and takes her home under the guise of a wheelchair-bound patient. Once in the city, Miranda proceeds to captivate every young man around her, but the eccentric local Nurse Cary (Margaret Rutherford) and Marton’s jealous wife Clare (Googie Withers) begin to wonder about their glamorous guest's predilection for raw seafood sandwiches and saltwater cocktails. Soon Miranda has a string of lovesick suitors competing for her attention, but she quickly becomes homesick for the sea.