Schoolgirl Nancy Drew (Bonita Granville) is at a newspaper on some sort of work experience gig when she gets onto a real case instead of reporting on a squirrel stuck up a tree. The case involves poisoning but Nancy doesn't think the suspect Betty (Eula Denning) did it. She wants her lawyer father (John Litel) to take the case but he won't do it until there is solid proof she is innocent...
Nancy is helped (usually reluctantly) by her neighbour Ted (Frankie Thomas Jr) to find evidence to clear Betty but stumbles upon a real mystery, just who is a man with a strange ear (Jack Perry) who is involved in the case?
It is light hearted fluff on the whole but features some nice detective work and an amusing set piece in a boxing gym. It also includes a rather strange but endearing musical interlude by a teenage Mary Lee.