This episode features the Green Hornet and Kato investigating a scientist, whose assistant's paralysis of the optic nerve, had rendered him blind. Now with the secret help of the professor, his sight has been restored, but it has come at great cost. An anti-Nazi himself, he soon finds himself at the mercy of the Gestapo, who are forcing him to work undercover, stealing vital secrets for the Nazis - or they will hurt his family.