Mr. Peabody and the Mermaid

William Powell plays Arthur Peabody, a middle-aged Bostonian on vacation in the Caribbean who catches and falls in love with a mermaid. As his wife Polly (Irene Hervey) suspects him of infidelity, Arthur tells a skeptical doctor about the source of his malaise, recounting how he discovered the singing mermaid on an uninhabited rock.