Casey takes a job as a factory file clerk in order to investigate a suspicious fire. Evidence points to a secretary with a history of mental illness, but Casey suspects that an arson ring may be responsible.
Casey gets involved in the lives of a woman and her daughter when they receive a series of threatening phone calls. The situation takes a strange turn when the young woman marries the man who makes the calls.
Casey goes undercover to recover a stolen ruby necklace before it can be fenced. Her investigation leads to an ex-convict who is inadvertently leading his teenage son into a life of crime because of the youngster's love for his father.
Newly arrived in New York, a young Puerto Rican man is arrested for robbery and assault. He claims to have been with two women at the time of the theft, but one won't identify him and the other can't be found.
Struggling artist becomes obsessed with Van Gogh, dressing like him and painting like him. When he is innocently coaxed into illegally copying a Van Gogh original, Casey, investigating the sale of the forgery, must find out who hired him.
When a roll of blank parimutuel tickets are stolen from a race track, Casey attempts to convince the gang responsible that she's a cop on the take who can help them pass the counterfeit ducats through crooks she's blackmailing.
Casey's visit to a girl she arrested and later befriended takes a turn into the macabre when she discovers the girl's brutal father dead. The girl claims to have shot him, but Casey isn't so sure she believes her.