New York private detective Duncan "Mac" MacLain is blind but has keenly developed all his other senses. He pursues his work assisted by his faithful guide dog Friday, his butler, Alistair, and his assistant, Marty. Retired actress Norma Lawry, an old friend, comes to Mac seeking advice. Her headstrong 17-year-old step-daughter Barbara, herself a promising actress, is enamored with her leading man in a small theater production, the much older Lothario Paul Gerente. Paul, who had once been Norma's lover, has convinced Barbara that Norma actually wants Paul for herself and has ...