A man was shot in the face in Heidelberg. A few days later another, very similar crime occurs. Suspicion falls on the town madman nicknamed Plasma, but he disappears without a trace. The head of the Heidelberg Center police department, Seltmann, has no doubt about Plazma’s guilt, but Hauptkommissar Theuer does not like this too obvious decision. He and his group have other versions. It turns out that both victims were lovers of the same woman, and this can hardly be considered a mere coincidence.