The film centers on Griffiths Jones playing Dr. Paul Martin, who abandons his marriage for a fishing excursion in Cornwall. There, he encounters "Miranda," portrayed by Glynis Johns, a playful mermaid who imprisons him within her underwater cave. She demands that he transport her to London, and with the assistance of Margaret Rutherford as "Nurse Carey," she causes disruption while charming every man she comes across…

This is an unassuming older comedy-fantasy film presented in black and white. I wasn't familiar with it until recently, and the only performer I recognized was Margaret Rutherford, a consistently working actress who appeared in many films over the years. Glynis Johns really elevates the movie with her attractive appearance, blonde hair, and lively presence as a mermaid character within the fantasy storyline. It’s …