Mary Carner (remember Death Wears a White Carnation), department store detective in New York, follows through on the disappearance of her friend, trails with the police when it proves to be murder, and is completely enmeshed when two more killings come along. In spite of danger to her own life, she leads the police to the killer and higher-up in gang life. Doesn't bear too close inspection, but good time-passer.