Julie Fresnel is a co-ed at Redgate University and her father, Dr. Henri Fresnel, is the new French professor. Julie attraction from the make students drops a bit when two of her admirers are found murdered. When an attempt on the life of a third one is made. Seth Dunlap, an instructor at the school, decides to turn detective and find the killer. Assisted by his sister, who is in love with the third student, Dunlap begins to follow the the small trail of clues left by the killer.

Two sisters from Indiana, the wide-eyed and innocent Mae Thorpe, and her more streetwise sister June, move into the Rolf House for Homeless Girls in New York. With June's help, Mae obtains a job as a stenographer for the scientist Joseph von Schraeder, while June gets work as a telegraph operator at Western Union.