The 18-year-old climate activist Cleo Pieper is killed. She was the Potsdam "climate Greta". With radical views on her blog, she not only made friends. Anastasia, Cleo's best friend, is shocked. They ran the blog together. Cleo regularly received hate messages and death threats. Cleo's biggest online enemy called "Lord of Hate" is targeted by investigators. The hate messages have worn Cleo down and she confided Danilo Voss. He fell in love with her. Did Cleo not reciprocate his feelings? It turns out, Cleo had fallen in love with Falk Seidel, the father of Anastasia. When the investigators find a shirt with Cleo that belongs to Falk, the suspicion hardens: Did he murder Cleo to cover up an affair? When a group of teenagers tries to set a fire in front of Cleo's house during a surveillance operation, the officers intervene: The harmless-looking teenager Elias Trenker was one of those who bullied Cleo on the Internet. Did he carry out his threat? (Text: ZDF)
