Frankie Kelly is the soda jerk and embryo scientist in Midvales only drugstore. Two murders and an attempted killing suddenly swing Midvale into national prominence. Frankie and his pal, Jefferson, become involved when a wounded gangster starts to tell them where $300,000 in stolen loot is hidden, but he is murdered before he can give them all of the information. The search is on.

A honeymoon couple in New York for one night of wedded bliss before he's to join the army, become involved with gangsters after they find a cadaver under their bed.

Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.