A bandit who robs both Americans and Mexicans is causing each side of the border to blame the other. Hoppy has to settle matters.

Dr. Paul Carruthers feels bitter at being betrayed by his employers, Heath and Morton, when they became rich as a result of a product he devised. He gains revenge by electrically enlarging bats and sending them out to kill his employers' family members by instilling in the bats a hatred for a particular perfume he has discovered, which he gets his victims to apply before going outdoors. Johnny Layton, a reporter, finally figures out Carruthers is the killer and, after putting the perfume on himself, douses it on Carruthers in the hopes it will get him to give himself away. One of the two is attacked as the giant bat makes one of its screaming, swooping power dives.

Sheriff Holt is determined to prove that prisoners can be rehabilitated and released into society in this prison drama. In charge of a new kind of program, the sheriff places inmates in a clean environment and makes them build a road. Despite the improved conditions, the criminals continue to pull off a few shady shenanigans as an innocent man who is sent there soon discovers.

A newsman helps a Brazilian singer get her brother out of trouble in New York.

A divorced glamour girl keeps warm with a professor amid sports and romance at Dartmouth College's Winter Carnival.