Police chief inspector Baerlach has just undergone surgery when his friend and doctor, Hugentobler, thinks he recognizes one of his own colleagues on a LIFE Magazine picture. The article is about Dr. Neyle, a Nazi doctor who practiced surgery without anesthesia in the extermination camps. This Dr. Neyle could now be the eminent owner of a private clinic for wealthy people in Zurich, Switzerland. Baerlach convinces his friend to transfer him in that clinic under a false name. How will Baerlach, who is still too weak to leave his bed, be able to unmask the evil doctor?