A series of unaffiliated casualties, a hit and run accident, the asphyxiation of a cat, and the killing of an insurance agent unloved by all, are related -- first on a hunch, then by the scientific methods of Jub Freeman, laboratory detective; In the interests of Andrea, pretty and frightened, Jub gets evidence from his test tubes, spectograph and microscopes to break the case, catch the killer and his girl. Competent job.