AllMovie

Heroes in Blue is predicated on the rivalry between two Irish-American clans. Sally Rand, the daughter of one family, falls for John Bowers, the policeman son of the other family. Their relationship is sorely strained when Rand's stepbrother Gareth Hughes turns out to be the pyromaniac whom Bowers has been ordered to seek out and arrest. Hughes ends up killing Bowers' father and brother, sparking a "retribution" climax in which Rand's fireman dad is forced to kill Hughes while the latter is setting fire to a tenement building. Heroes in Blue includes a cute "inside" gag in which Sally Rand and John Bowers attend a movie -- in which the stars are Sally Rand and John Bowers!