Eyes in the Night (1942)

Famed stage actress Norma Lawry retired upon marrying Stephen Lawry, considered one of the finest scientific minds, he working on a project the nature of which Norma does not know. He states its successful completion could change the face of the war. Norma tries to warn her seventeen year old stepdaughter Barbara Lawry, also an actress, from getting involved with Paul Gerente, her costar in a regional stage production. Norma knows first hand that Paul is a cad in once being engaged to him, such a warning which Barbara attributes to jealousy in believing that Norma is in love with him herself and that she only married her father for his money. When she may be implicated in a murder in discovering a dead body, Norma turns to her old friend, private investigator Duncan Maclain, to help her, he in turn being assisted by his two right hands, Marty and Friday, they his literal eyes in Mac being blind, Friday his guide dog, although Mac in general functions quite well on his own in most circumstances. If he gets too close to the what is happening and the plot that led to the murder, Mac may place his, Friday and Norma's lives among others in danger, that is unless the perpetrator(s) underestimate a blind man.