Private investigator Mac MacLain, who is visually impaired, relies on his heightened senses to solve cases in New York City. With the help of his loyal guide dog Friday, his butler Alistair, and his assistant Marty, Mac takes on a new challenge when retired actress Norma seeks his advice. Norma's step-daughter Barbara, a talented actress, becomes entangled with a manipulative older man named Paul. When Paul is found dead in his apartment, Barbara accuses Norma of the crime. Mac steps in to unravel the mystery, discovering a web of espionage involving Norma's butler Hansen and maid Vera. As the danger escalates, Mac must outsmart the spies and save the day with the help of his trusty companions. In the end, justice is served and the truth is revealed, bringing closure to the tangled web of deceit.