Eyes in the Night (1942)

Blind detective Duncan Maclain is visited by old friend Norma Lawry, looking for help in getting rid of one of her old beaus, who is courting Norma's 17-year old step-daughter. When the old beau is found murdered, Norma is the chief suspect until Duncan (aided by his guide-dog Friday) pays a visit to her home and uncovers a plot to steal her husband's military secrets for the enemy.