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Katja Manteuffel, Head of Department of the Berlin University Ophthalmic Clinic, ist found murdered. The investigation lead detectives Ritter and Stark to the Cornea AG, a firm which has developed a revolutionary retina chip within highly secret project "Phydra". This chip was implanted into the eyes of a blind patient shortly after Katja Manteuffel was murdered. Soon the detectives set sights of ophtalmologist Mareike Andresen. Because of the murder she was able to performed the sensational operation. A golden opportunity for the young surgeon. But did she murder for it?
When Ritter and Stark learn the victim had a secret affair with Tim Nicolai, fiancé of Mareike Andresen and Head of "Phydra", he too comes under suspicion. Did Katja Manteuffel threaten Tim Nicolai to tell his fiancée about the affair? It might have meant Nicolai's end in the firm as Cornea's president is Mareike's father.
And as if that wasn't enough Ritter learns from the attractive scientific assistant Judith Wenger...