Eyes in the Night

New York private detective Duncan "Mac" MacLain is blind but has keenly developed all his other senses. Skilled in self-defense, he pursues his work with the help of his faithful guide dog Friday and assistant Marty.

Retired actress Norma Lawry, an old friend, comes seeking advice. Her headstrong 17-year-old step-daughter Barbara, herself a promising actress, is enamored with her leading man, the much older Lothario Paul Gerente. Paul, who once had been Norma's lover, has convinced Barbara that Norma actually wants him for herself and only has married her father Stephen for his money. At Mac's urging, Norma tries to reason with Paul, but he insists that he loves Barbara and laughs her off. Barbara is equally disdainful of Norma, and to spite her calls Paul in front of her to set up a tryst with him that night at his apartment.

Norma's husband Stephen is a scientist leaving on a trip to test a secret invention he has been developing for the U.S. WW II war effort. Worried about Barbara, she uses a pretext not to accompany him. When Barbara gets to Paul’s apartment she finds him dead and Norma there, and concludes that Norma has killed him; Norma insists she'd found him that way. Barbara threatens to call the police unless she leaves Stephen.

Fearing that a scandal will hurt Stephen's efforts, Norma agrees to Barbara’s blackmail. Norma then turns to Mac, who goes to Paul's apartment with Friday and Marty, only to find the body and the rug under it missing. A man arrives to replace the rug, and Mac overhears him call to Norma's number saying it's "Gabriel" and asking for "Vera." Mac accidentally gives himself away, but with Friday's help overpowers the thug, who refuses to talk. Mac has Marty hide him to keep him under wraps.

Norma is out when Mac arrives at her house pretending to be her curmudgeonly "Uncle Mac" who has come for a visit. His blindness lulls any suspicions Hansen the butler - second in command of a German espionage ring seeking to get Steven’s sec..