Glynis Johns in one of the most charming performances ever. She is absolutely irresistible as a mermaid named Miranda Trewella.
Dr.Paul Martin takes a solo fishing vacation because his wife Clare has no interest in fishing. Paul ends up hooking a mermaid and is pulled into the water. He wakes up in her cave. She tells him her name is Miranda and she’s thinking of keeping him. Then she tells him she wants to go to London. Paul explains to his wife that he’s bringing an invalid patient home for a few weeks. He gets special dresses to cover her fish tail.
Miranda very shortly gets every man she meets to fall for her. That includes Paul, his chauffeur Charles and friend Nigel who is engaged to upstairs neighbor Isobel. Paul hires Nurse Carey (Margaret Rutherford) to look after her. She sees her in the bathtub and there’s no doubt about what Miranda really is and Nurse Carey is thrilled. No one else knows.
Charles is engaged to house maid Betty who becomes jealous. Nigel is an artist and Isobel drops by his studio and sees he’s painting a portrait of Miranda. Another jealous woman. It gets worse after the women discover Miranda gave their men lockets with her hair in them. She told them to wear the lockets around their necks as a token of love.
Charles is so smitten he breaks his engagement to Betty. The engagement between Nigel and Isobel is also off. One night Paul takes her out to the river so she can take a swim. He jumps in with her. Eventually Clare is starting to put things together.
Glynis Johns and Margaret Rutherford reprise their roles in 1954’s “Mad About Men.”