AstoldtoapsychiatristMr.Peabody,middle-agedBostonianonvacationwithhiswifeintheCaribbean,hearsmysterious,wordlesssingingonanuninhabitedrockinthebay.Fishinginthevicinity,hecatches...amermaid.Hetakesherhomeand,thoughshehasnospokenlanguage,fallsinlovewithher.Ofcourse,hiswifewon'tbelievethatthinginthebathtubisanythingbutalargefish.Predictablecomplicationsfollowinrathertamefashion.