The Protectors are assigned to locate Professor Schelpin, a scientist who has defected from Russia to the West. In fact he surfaces at a conference where he declares his intention to demonstrate the evils of germ warfare, before disappearing again. The Protectors discover that he has a phial of germ warfare toxin, which he plans to release on the anniversary of the Hiroshima bombing and must be stopped.
—don @ minifie-1